STRONG CONSTRUCTION FOR BETTER PERFORMANCE Yes4All Dynamic Slam Ball is specially designed to be thrown thousands of times without breaking or being deformed. Engineered for intensive repetitive exercises the slam ball is sand-filled with a PVC shell which allows the ball to absorb the energy of a slam instead of bouncing or rolling away. CLEVER DESIGN FOR EFFECTIVE FITNESS WORKOUT The uniquely textured shell provides a non-slip grip to catch the ball more easily. Yes4All Slam Ball features a seamless construction to prevent it from splitting over time of use. This is a perfect ball for exercises like wall slams overhead throws Russian twists & squats. Great tool for Crossfit workouts personal trainers core strengthening sports training like boxing wrestling & more. WHY SHOULD YOU TRAIN WITH A SLAM BALL? Helps build muscle mass