Our best-selling Slam Ball features a grooved tire tread texture, no slip grip and bounce-resistant construction. Get ready for the ultimate cardio, agility, and strength training tool you’ve ever met. Learn more Our best-selling TRX Slam Ball is the perfect cardio, agility, and strength training tool. Featuring a grooved tire tread texture, no-slip grip, and bounce-resistant construction, this slam ball is designed to help you build muscle, improve rotational strength, and fire up your core. Say goodbye to fad workout trends and hello to the best version of yourself! Product specifications Textured tread exterior for maximum efficacy No-slip grip design Bounce-resistant construction Double-walled interior for maximum durability Sand-filled inner shell to maintain shape 60-Durometer rubber for comfort during heavy use Not for use on concrete or pavement