Feel the burn through your whole body with the Cortex 15kg 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.The tyre 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.