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. Key Features A SLAM DUNK FULL-BODY WORKOUT The square grip tiles provide superior grip and traction for your high-intensity movements. The Force USA Elite Slam Ball uses specific sand to air ratio to ensure minimum bounce during use. The movement of picking up your Force USA Slam Ball after every use challenges your cardiovascular endurance and conditions your entire body from head to toe. Constructed with an extra-thick rubber blend casing for durability, the Force USA Slam Balls come with a textured surface area coated with a UV protected and anti-bacterial coating for maximum grip and longevity. 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. Available in 14 sizes: 4kg, 5kg, 6kg, 7kg, 8kg, 9kg, 10kg, 12kg, 15kg, 20kg, 25kg, 30kg, 35kg, 40kg, Diameter 4kg - 10kg: 25cm Diameter 12kg - 30kg: 30cm Diameter 35kg - 40kg: 32cm