The Centr Smart Stack 50 (pair) adjustable dumbbells are engineered for strength, comfort, and durability. Designed to let you train with ease, simply rotate the bi-directional ergonomic handle to select your preferred weight from 5 lbs to 50 lbs per dumbbell. The Centr Smart Stack 50 comes with Centr's connected digital coaching offering hundreds of workouts to train with your adjustable dumbbell. The Centr Smart Stack 50 is constructed for a safe and efficient workout. A dual steel pin locking system ensures each plate is locked into place when in use and the magnetic base keeps the weight plates organized for quick and easy weight selection. Also, the streamlined design highlights the weight viewfinder, in both LB and KG, which quickly tells you what weight you are lifting. This adjustable dumbbell is made from commercial-grade components to withstand heavy use and ensure durability. Its compact space-saving size, with each dumbbell measuring at just 16.5” L x 7.9” W, allows you to replace up to 20 individual dumbbells (per pair) and maximize the space in your home gym.