Using the Lifeline Medicine Balls is an excellent way to develop total body strength, power and stability. They feature a unique textured surface for sure-handed grip, uniform wall thickness for superior balance, and a durable rubber construction that provides medium bounce. These balls are designed for handheld, light bouncing & rebounding and throwing exercise training use and are offered in 2lb increments, allowing you to progress as you build strength and coordination. The large weight markings provide easy level identification.