Adjustable for perfect fit. Made of soft, flexible materials. Straps keep weights on hands. Perfect for people who have difficulty gripping conventional weights. Get all the benefits of traditional weight training without using hard-to-hold metal dumbbells. The round shape and unique Velcro safety strap of the Palm Bell hand weights keep them in your hand, even if you have arthritis or have trouble gripping. This makes the Palm Bell hand weights very safe to use and easy to hold. And, an inflatable air chamber inside the Palm Bell allows you to adjust the fit perfectly to your hand. Each set includes two Palm Bell weights and air pump. LENGTH: 27 cm. WIDTH: 13 cm. HEIGHT: 14 cm. WEIGHT: 4.9 kg.