This versatile slam ball is designed to work your entire core, shoulders, and arms while helping to develop explosiveness. Made with durable, sand-filled construction, it's gym-tested to withstand multiple slams. The pliable, rubber-like surface offers a better grip for all types of workouts. Available in various weights from 10 to 45 lbs, it's perfect for tossing, throwing, and slamming. Made from rubber-like PVC for added durability.