Adjustable Dumbbell (Single) by ROBURFLEX for Workout Strength Training Fitness Home Gym
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Availability:
In Stock.
Arrives
Friday, Jul 11
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) for Workout Strength Training Fitness Home Gym
Brand: Roburflex
Color: BLACK - 40LB Extendable
Material: Cast Iron
Special Feature: Adjustable Weight
Product Dimensions: 21"L x 7"W
Brand: Roburflex
Color: BLACK - 40LB Extendable
Material: Cast Iron
Special Feature: Adjustable Weight
Product Dimensions: 21"L x 7"W
Style: Adjustable Dumbbell
Handle Material: Stainless Steel
Number of Pieces: 1
Global Trade Identification Number: 34
Manufacturer: Krato Fitness
Item Package Dimensions L x W x H: 17.75 x 11.75 x 10.5 inches
Package Weight: 20.32 Kilograms
Item Dimensions LxWxH: 21 x 7 x 7 inches
Brand Name: Roburflex
Part Number: RF-AD
Size: 40LB
Date First Available: February 19, 2024
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Jul 11
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
I've been lifting almost daily with these. They work great with no complaints
Reviewed in the United States on May 13, 2025 by BirdFamily
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
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. Ryan D.
Color: BLACK - 80LB
The weights are well constructed, the adjustment works well, and it feels good in the hand. I like that this set goes from 5 to 80 lbs, but this product only comes as one, not a pair. If you need two, you must purchase a quantity of two. The price point is high. I like this set very much and would highly recommend it if you don't mind the price.
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Reviewed in the United States on February 22, 2025 by E. C. Taylor Jr.
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: 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 Omar Ahmad
These dumbbells are great. Back in 2019-2020, I finally got the motivation to start going to the gym and putting myself into shape. But unfortunately, all the gyms were temporarily closed due to covid. So, I decided to build my own gym at home. Unfortunately, my space is very limited. And these were perfect for my situation. Saves space, adjustable weight, looks cool. As long as you treated them nicely, not dropping it, being sure each plate was aligned before adjusting it, they work wonders. Although after about a year in, one of the handles broke and stopped adjusting. So, I emailed customer service, and quickly I was able to order a replacement handle. Super easy! I received the part, replaced it, and got back to work. Just recently, the other handle stopped working as well. Same thing, emailed customer service, and ordered a replacement part. Even during holidays and weekends they were able to reply quickly. I’ve been nothing but satisfied with this product and this company. If you're debating whether or not to order this, you should do it. Other companies sell one dumbell for at least $800. For the amount it costs, this is more than perfect.
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Reviewed in the United States on January 6, 2024 by Jayven