We thoroughly research and design our product and only sell top-of-line fitness products. SMRTFT NUOBELLs are designed to be highly durable under non-commercial use. We understand our community might think this because the weights adjust so seamlessly. But, with regular use, the SMRTFT NUOBELLs last for years. It should be mentioned that similar to other adjustable dumbbell products, we do not recommend dropping or slamming the dumbbells. If you have any concerns about how your NUOBELLs operate, simply reach out to our Support team with photos and/or videos of your NUOBELLs, and we're happy to help! You can add 1 or 3 years of our SMRTCARE Extended Warranty on top of the built-in 2-year Manufacturer's warranty that comes with your purchase.