The Ignite by SPRI Slam Balls are durable, sand-filled no-bounce balls that are ideal for tossing and slamming activities. Made from heavy-duty rubber shell for maximum stability, these Slam Balls are perfect for total body exercise, core strengthening workouts, and explosive power movements. Our tough rubber shell provides maximum durability with a pliable, tacky surface, making it easy to grasp and throw. Designed to have the durability required to be slammed to the ground many times over each workout, without losing shape or breaking. Available in 10 lb. and 20 lb. weights.