The EcoWise Environmentally Friendly Slim Olive Weight Ball"s ergonomic shape fits your palm. With detachable strap for additional gripping in hand. Patented Neuwa Material is Latex, PVC, and Chloride free. Compact, lightweight, and great for using at home or when traveling. A soft and comfortable alternative to traditional dumbbells. Improves core strength, functional movement, target muscle tone and flexibility. Set includes: One 1, 2, 3, and 4 lb balls.