Adjustable Dumbbell (Single) 5-40/80lb, 5lb Increments, for Home Gym Fitness - Upto 20 weight settings
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Availability:
In Stock.
Arrives
Friday, May 15
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Color: BLACK - 40LB Extendable
Features
- SMART DESIGN: Traditional adjustable dumbbell length remains fixed even with smaller weights. The adjustable dumbbell's length reduces with lower weight selection, providing you a wider range of arm movement. The vibrant colors with matte finish blends anywhere in your home.
- 1-SECOND WEIGHT CHANGE: One hand turn for fast weight adjustment. Enjoy fast adjustment and gain better training efficiency.
- SPECIFICATIONS: The dumbbell plates are made of 95% cast iron, hence are extremely durable.
- THIS PRODUCT IS SOLD AS A SINGLE DUMBBELL. Recommended quantity is to buy in a pair (Quantity = 2).
- WARRANTY & CUSTOMER CARE: Roburflex adjustable dumbbells come with a 2-year warranty which covers all functional damage to the product and replacement of all parts. Please contact roburflex customer support for any warranty claims or concerns (details are in the product manual).
Description
ROBURFLEX Adjustable Dumbbell (Single) 5-40/80lb, 5lb Increments, for Home Gym Fitness - Upto 20 weight settings
Brand: Roburflex
Color: BLACK - 40LB Extendable
Material: Cast Iron
Special Feature: Adjustable Weight
Product Dimensions: 21"L x 7"W
Item Dimensions L x W: 21"L x 7"W
Number of Pieces: 1
Color: BLACK - 40LB Extendable
Style: Adjustable Dumbbell
Material: Cast Iron
Handle Material: Plastic
Other Special Features of the Product: Adjustable Weight
Brand Name: Roburflex
Global Trade Identification Number: 34
Manufacturer: Krato Fitness
Unit Count: 1.0 Count
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, May 15
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: GREEN - 40LB Extendable
The media could not be loaded. Really impressed with this one! I wanted something adjustable so I wouldnt need multiple dumbbells around and its been really convenient!! I have tried a few similar options, and this one feels the most solid and well made. Changing the weight is super quick and easy, feels sturdy in hand and doesn’t take up much space. Overall a great option if you want a compact, safe to use, adjustable dumbbell. Take a look at the pics and videos I attached.
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Reviewed in the United States on March 7, 2026 by tyngent
Color: GREEN - 80LB
The ROBURFLEX adjustable dumbbell is a game-changer for my fitness routine! It’s perfect for strength training at home and eliminates the need for multiple dumbbells, saving both space and money. Adjusting the weight is quick and seamless, allowing me to switch between exercises without breaking my flow. The build quality is outstanding—it feels solid and well-balanced in hand, with no rattling parts. The grip is comfortable and non-slip, even during sweaty workouts, which is a big plus. I’ve used it for everything from bicep curls to shoulder presses, and it performs flawlessly. Whether you’re just starting out or are an experienced lifter, this dumbbell is an amazing addition to any home gym. I highly recommend it for its convenience, durability, and overall design!
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Reviewed in the United States on January 21, 2025 by Alex
Color: GREEN - 40LB Extendable
Great quality adjustable dumbbells with a solid 40lb weight range, perfect for home workouts. The matte green finish looks premium and doesn’t scratch easily. Easy to adjust weights, making workouts quick and efficient. Grip feels secure and comfortable even during heavy sets.
Reviewed in the United States on February 2, 2026 by Arsalan
Color: GREEN - 40LB Extendable
I just recieved this item today and it's already a 40lb piece of garbage out of the box. I placed the dumbell and cradle on the floor immediately out of the box. My first attempt to pull the dumbbell out of the cradle was successful - it was set to 25 pounds and I pulled out 25 pounds. However. When I tried to return the dumbbell to the cradle, it absolutely would not line up with one side of the remaining weights. I reset all the weights in the cradle by aligning them with the trapezoid shaped guides and then tried again. Once my dumbbell was able to align with thr remaining weight, I tried to size up to 30. However, this time, the weights refuse to leave the cradle and pulling the handle results in ALL the weights and the cradle to go with the dumbell. I have continually attempted to reset the alignment of the weights and the dumbell and continuously the handle gets stuck (can't turn), or weights get stuck, or I can't align the dumbell back in. Furthermore, just to really hughlight whatever the QA process is like for these Dumbells, the indicator on the handle is reversed -> rotating in the + direction decreases the weight and rotating in the - direction increases the weight. There is a lot of promise in these Dumbells, I like the sleek design and the turning mechanism, but if they can't even adjust weights then they're just a waste of money.
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Reviewed in the United States on July 21, 2024 by Stephanie E
Color: WHITE - 80LB
These dumbbells are amazing. They are the best quality out there. I have had them now for over two years. The ease of use is outstanding. The 5# incremets is perfect. The customer support is exceptional. My ex wife knocked these over while I was out of the house. She broke 2 plastic clips that I could not JB weld if I wanted to. Customer care fed ex shipped me new parts no questions asked over night and then followed up that they work and I did not have questions. I would recommend to everyone
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Reviewed in the United States on March 2, 2026 by Joe A
Color: GREEN - 80LB
Easy to use and are great if you have limited space. Unfortunately, after about a month of use one of the little plastic clips has broken. Not sure how it can be repaired.....so I might come back and change my review.
Reviewed in the United States on May 28, 2025 by Ryan D.
Color: GREEN - 40LB Extendable
The media could not be loaded. So now that I have been using the Ruborflex set for over a month, I figurerd this product definitely deserved a proper review. 1st video : the most important thing is adjustable dumbells is how seamless yet secure the switching from weight to weight is. This is the best product I have seen in seamless and safe switching from weight to weight. Every weight clicks in perfectly and the dumbell won't lift if it's not engaged properly . 1st image: the grip is precision knurled for lifting. Definitely much better than most of the smooth wear off knurled grips I have seen in the gyms. 2nd image : flat bottom gives you the advantage of stability for push-ups and likewise exercises. Yet keeping a very even weight distribution all over the hand/wrist area. 5th image: easy to lift, move around and put down without fear of shattering your fingers. Ergonomically speaking its an astute design. The matte army green looks great. I haven't seen other products in the same category offer such great color and texture finish. Overall, the ruborflex caters for everything one could expect out of an adjustable dumbell set. Great value for money. Even weight distribution and stability on both sides.
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Reviewed in the United States on May 23, 2024 by Omar Ahmad
Peloton of Dumbbells. Can’t emphasize enough on the quality and the looks. Very proud of my research and finding this gem I did a lot of research on adjustable dumbbells and I opted against dumbbells designed like Bowflex/Ativafit as I had concerns their wide length will end up limiting motion in most exercises. So I was left with choice between these, Snode, and Core Fitness. I went with this as the colors in these dumbbells looked good and I am getting more pounds per price than the the other 2. I have used these dumbbells quite a few times and I am quite pleased with the high end quality, built, functionality and the looks. I will list down the Pros and Cons. Pros: really quick weight adjustments, amazing price per pound, weight evenly distributed, and allows wider range of motion then the bowflex/ativafit type dumbbells. Cons: Weight is in kg instead of pounds and the increment is at 4kg (i.e. 8.8 pounds) which might be considerable for a beginner. However, considering the built quality, these are totally worth the investment
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Reviewed in the United States on August 3, 2021 by Wasif Shabbir