Impact-absorbing soft outer shellDurable ball for strength trainingSuperior grade core uses no corkVarious weights availableDimensions: 9- or 10-inch diameterOne-year manufacturer's defect warranty. The Xtreme Monkey Commercial Slam Ball presents an extra-durable alternative to medicine balls for cross-fit strength training aerobics and more. Whether you're performing slams throws chops or any number of exercises you'll find this weight ball a perfect choice. Its extra thick anti-burst wall can take its share of punishment and features a textured surface for a sure grip. The balls come in either a 9-inch (for 10-25 lbs.) or 10-inch (for 30-50 lbs.) diameter.10lb. 15lb. 20lb. 25lb. 30lb. 40lb. and 50-lb. balls are each available. About United Fitness Group Inc.Committed to excellence in all areas United Fitness Group incorporates a number of name brands to provide its customers with the finest in training and fitness equipment. Whether you're looking to outfit a professional gym school sporting equipment or simply expand your home gym United Fitness has you covered. Frequency Fitness TKO Boxing and Jasmine Fitness are just a few of the fine brands offered. From Pilates accessories to boxing equipment to weight training and more United Fitness is here to exceed your expectations. Size: 50 lbs..