Fitness First brings you a multi sized workout dream. Large landing surface (30" x 36") stackable soft plyo boxes come in 4 different sizes including 6, 12, 18 or 24 inch heights. Made of soft durable padded foam to help protect the safety of the athlete using them. It will protect your knees and joints and shins in case of missing the jump. Stackable and takes up minimum space. Made with a pvc cover to easily wipe down.