Waterproof with great anti-slippery grip - High-Quality Rubber material, Waterproof with great anti-slippery grip. Made from high quality durable rubber, you can throw, bounce, catch and hold for a huge variety of exercises. Commercial Grade for Gym use - It can be used to strengthen shoulders, back, arms, abs, legs as well as improving core trunk strength. Made from high quality durable rubber, you can throw, bounce, catch and hold for a huge variety of exercises. Medicine ball is a great tool for a complete body workout. It can be used to strengthen shoulders, back, arms, abs, legs as well as improving core trunk strength. High-Quality Rubber material, Waterproof with great anti-slippery grip. Commercial Grade for Gym use.