ZSTARR U Channel Aluminium Alloy Light Blocking Strips for Roller Blinds Light Gap Blockers Window Shades Side Rail Tracks Bedroom Sleep Nursery (Grey,58",2Pcs)
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Availability:
In Stock.
Arrives
Thursday, Mar 19
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Color: U-shaped Grey-2pcs
Size: 58‘’
Features
- Why we need to install light blockers for shadesMost blinds and blackout shades are made slightly narrower than the window frame to allow smooth raising and lowering. This design often causes light leakage from the sides. If your blackout blinds or shades still let in unwanted side light, this common side gap issue can reduce room darkening. ZSTARR light blocking strips are designed to help solve this problem and improve overall room darkening performance.
- Latest U-shaped Aluminum Alloy Light BlockersZSTARR light blocking strips are made of thickened aluminum alloy tracks for long-lasting durability. The U-shaped design allows the blockers to be installed along the sides of window shades and blinds, providing more stable coverage. By fitting closely against the edges of your blackout blinds and shades, these light blockers help reduce light leakage through the sides. They create a darker indoor environment, helping improve privacy and support better sleep quality. Designed to reduce side light gaps, not to replace blackout shades.
- Easy To InstallSimply fasten the light blockers onto the window frame with screws for a secure fit. After removal, the side light blockers can be reused by reinstalling the screws. The light blockers can be combined or cut to length using a cutting machine for a custom fit. Size: 58 1.6 0.99 inches (2 PCS). Accessories include side covers (4 PCS), installation instructions, and screws. For maximum coverage, install as close to the blackout shades as possible. Please refer to our installation video for proper installation and alignment.
- U-shaped Light-blocking Side TracksThese blackout side tracks are ideal for night-shift workers, light-sensitive sleepers, or anyone creating a darker room during the day for sleep, movies, or gaming. Applicable to roller shades and blinds, zebra shades, and other blinds and shades. Not suitable for cellular shades or honeycomb blinds. Recommended for inside-mount blinds with flat window frames and sufficient depth ( 1 in). Designed for blinds with a slim bottom rail (recommended width 0.5 in) and to reduce common side light gaps ranging from 0.21.5 in, allowing closer edge coverage and improved room darkening.
Material: Aluminum
Brand: ZSTARR
Color: U-shaped Grey-2pcs
Opacity: Blackout Inches
Recommended Uses For Product: Indoor
Material: Aluminum
Brand: ZSTARR
Color: U-shaped Grey-2pcs
Opacity: Blackout Inches
Recommended Uses For Product: Indoor
Room Type: Bathroom, Bedroom, Home Office, Kids Room, Media Room
Operation Mode: Manual
Special Feature: Light blocking
Included Components: User Manual
Shape: Rectangular
Number of Items: 2
Pattern: Solid
Item Weight: 1.47 Kilograms
Product Care Instructions: Spot Clean Only
Size: 58‘’
Mounting Type: Inside Mount
Number Of Panels: 2
Water Resistance Level: Not Water Resistant
Control Type: Manual
Number of Packs: 2
Manufacturer: ZSTARR
Package Dimensions: 59 x 2 x 1.5 inches
Item Weight: 3.24 pounds
Item model number: U40 -Grey-58.5in-2pcs
Batteries required: No
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Mar 19
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: L-shaped White-2pcs
Size: 58‘’
Exactly what was advertised, easy enough to cut, and worked perfectly for my application which was to reduce light leaking above the curtains!
Reviewed in the United States on January 12, 2026 by LdRockingham
Color: U-shaped Custom
Size: 44''-115''
I have a Yoolax roller shade in my bedroom that is surface mounted on a window. Quite a bit of light gets past the edges when closed, so I bought these to help cut down on the light leakage. These are very sturdy and have a soft fabric "brush" on the inside edges to protect the edge of the window shade. I had to shorten these channels to fit my windows, I just used my table saw with a fine tooth blade to cut through the aluminum channel. The plastic cover on both ends is removable, just make sure to clean out the channel as there are some grooves that the end piece needs to fit in to lock it in. I used a thin run of double sided tape to adhere these to the outside trim of the window. The weighted bottom of the Yoolax shade fits nicely in the channel and the shade still opens and closes without binding. Looks nice and the color is very close to the metal valance of my roller shade.
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Reviewed in the United States on March 17, 2024 by E Reed E Reed
Color: U-shaped Custom
Size: 44''-115''
I have roller blinds that let in a ton of light through as a result of direct sunlight on the window. This was able to get rid of a large amount of it, but it did let through a significant amount. However, with some modifications of my own, I got it working perfectly, and I dare say not a single photon makes it around the inside of the track. 1. Make the inside of the track black somehow, like with spray-paint. With all three sides on the inside black, that absorbs like instead of reflect it like the bare aluminum does. This alone reduces the amount of light leaking through by like 80%. 2. Use larger brush strips. At least for me, the brushes didn't really block much light that was reflected around. Fortunately they can just be removed and replaced. So I bought some rolls of brush weatherstripping myself - You will need some that has a width of 5mm width or 3/16 inches. The brush length required will depend on your situation, but I actually found a combination of two lengths worked best. For the "inside-side" I used half-inch length brushes (so 5mm x 12mm brush weatherstripping), and on the "outside-side" I used 5mm x 8mm. This is because I found with just the 8mm width ones, it still let some light through, and the 12mm ones would have prevented the bottom bar thing from moving. But this combination allowed movement of the roller blinds and still seems to go right up to the blind, therefore blocking any rest of the light. You can try other combinations of brush length though. Otherwise, it was convenient that they cut the tracks to size and also drilled the holes, and they shipped it faster than expected. So to sum up, the main improvement I think they should do is paint the inside of the track black. I also think the brushes should be a bit longer by default, but that's not as big a deal because you can just buy replacements.
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Reviewed in the United States on October 20, 2023 by Joe Thio
Color: L-shaped White-2pcs
Size: 58‘’
Put in kids room to help block light on the sides of the shades. It does a excellent job!
Reviewed in the United States on December 14, 2025 by Dave
Color: L-shaped Custom
Size: 44''-115''
I was a little reluctant to buy it because I know they aren’t returnable. I measured with my tape measure, confirmed the measurements when they messaged me after purchase and I received them in a very hard cardboard tube so the pieces were not damaged or bent at all. After ordering two sets and seeing how great they were and worked, I ordered two additional sets, and it was very happy with the quality and with the consistency! The measurements were perfectly spot on. I don’t think the black tape is necessary for anything. I think it’s supposed to absorb light, but it doesn’t do anything so I left that off. The tape that comes on the pieces with the adhesive is very strong and super easy to stick up!
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Reviewed in the United States on June 11, 2024 by Lelo84
Color: L-shaped Black-2pcs
Size: 58‘’
I was setting this up in my kids room on two windows. I managed to do the first window without any issues, but I misaligned the second window and some light was creeping through. I thought oh no problem, I see where I misaligned the initial placement. Wanted to redo my placement and I cannot remove these from my wall! I removed one side of the blockers with minimal issues, but this other side ended up damaging my wall. The adhesive was so strong the blocker ended up snapping as I was trying to remove it. I'm now stuck with half of this light blocker in my kid's window frame and I have no idea how to remove it. At this point, I just need to remove it with minimal damage to my window frame. If you can do this on your first try, you're golden and works like a charm. Slight misalignment and need to redo the placement? Expect a headache.
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Reviewed in the United States on October 26, 2024 by Clay V
Color: U-shaped White-4pcs
Size: 58‘’
I had roller shades professionally installed in a new condo and couldn’t stand the light leakage out the sides. The room was so bright with the shades all the way down. Apparently, Graber doesn’t sell side channels for the expensive shades we purchased and I didn’t even realize it would be a problem until they were installed. I purchased these UChannels from Amazon and had the company that sold us the shades cut them and install them using 2 wood screws. I then had to buy rope caulk and put it behind the channels to block the slivers of light that came through the wood frame and the channels. The room is much darker now and I am happy with the purchase. Before and after pics attached to review.
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Reviewed in the United States on August 17, 2024 by iwanttobead iwanttobead
Color: L-shaped White-2pcs
Size: 58‘’
I have roller blinds in my bedroom which means that there was a 0.5”-0.75” gap on each side so I bough 5 pairs of these and now my room is much darker. They look clean and made of thick material. The 3M tape is pre-installed so you just have to measure twice, cut to size and stick it to your window pane. Some reviews mentioned that it is hard to cut. I have a miter saw so I cut through these easily but since they are made with thick plastic, I wouldn’t advise trying to cut them with shears. At a minimum you’d need a hand saw. I had an issue where one of my orders wasn’t as wide as the other and seller sent me a replacement set right away. Don’t worry about these being too wide because they still look great. See my pics. Not 100% blackout because it depends on how your roller blinds were install but for my family, it’s given us 2-3 hours more sleep with the early daylight we get in Southern California.
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Reviewed in the United States on July 30, 2023 by Ivan C. Ivan C.