Brand New in the Box! TRX 15 Pound Black Weighted Slam Ball for Full Body Training Workouts FEATURES: 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. The TRX Slam Ball is the ultimate cardio, agility, and strength training tool with a grooved tire tread texture, no-slip grip, and bounce-resistant construction. This best-selling ball allows you to build muscle, fire up your core, improve rotational strength, and slam your way into the best version of yourself! 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 GREAT ITEM AT A GREAT PRICE!!