Produces no bounce and accurate weight Square grip tiles design, and tested to be the best design for grip design. Increased durability, long lasting Can can used for core, legs, and shoulder training. Alot of the movements that can be performed are very transferable into the sporting field. Excellent way to keep heart-rate elevated for max calorie burn. The Force USA Elite Slam Balls deliver enormous workout potential by teaching your body proper hip activation, hip extension, coordination, force production and core control! Develop strength, power and endurance through a range of functional movements with this highly versatile piece of equipment. Designed to sink into the ground rather than bounce or roll around, the Force USA Slam Ball will give you a whole-body workout. Available in a range of sizes from 4kg to 40kg.