Cortex - Feel the burn through your whole body with the Cortex 30kg Slam Ball X Series. Built as an alternative to medicine balls able to withstand strong pounding through a tough workout, slam ball exercises are high-intensity, full-body workouts. Thetiree tread grip of the Slam Ball X offers greater traction for easy gripping and reduced free rolling. The result: guaranteed safe use in rough and intense workouts. The thicker rubber grip also prolongs the life of the Slam Ball X, making it less susceptible to wear and tear.Our new Slam Ball X is perfect for throwing exercises, with a harder shell than standard medicine balls, great for explosive movements and workouts. A new textured surface makes these slam balls easier to grip and more durable in the long run. *Not for commercial use.