HIGH-DENSITY MEDICINE EXERCISE BALL: The Weight Ball is filled with iron sand to prevent it from bouncing or rolling and enhance the balance, Improve the gravity of the product and firmness of the ball RECYCLED RUBBER MATERIAL: Yes4All Slam Ball is made from recycled rubber to reduce the smell. We also bring out a new logo added on it TEXTURED SURFACE: Yes4All Weight Ball features a grooved and textured PVC shell to help you get a firm grip on the ball even with sweaty hands THICK SEAMLESS DESIGN: Specially formulated resilient soft shell which is rotationally molded for a seamless construction to add more durability and ensure it cannot be split over time of use BOOST YOUR AEROBIC CAPACITY: Medicine Exercise Ball Workout can help you improve muscle mass, increase your heart rate & burn more calories, and enhance coordination between your hands & eyes for smooth movements in sports