These slam balls are designed to stand up to it's name, SLAM! Put all your energy into slamming these against the wall or floor to maximize the workout. Don't worry, these balls are made of high quality, heavy duty, high endurance material to withstand the toughest slams. Easy grip, unique design will ensure that the ball does not slip out of your hand while you work out. Non- bounce ball, the interior of this ball is filled to prevent the ball from bouncing or rolling away to allow you to perform different kind of throwing and slamming exercises. These slam balls are the perfect size, handheld, yet not to small to hurt your fingers as you go for that wham and give it your all. Comes in many sizes, ranging from 4 LB to 100 LB to satisfy all weight size users, and help you achieve greater endurance as you build up resistance. Sport type: American Football