FREE SHIPPING! These extremely durable bands come with a protective covering that keep them from being over extended and shield you from being snapped in the rare case they'd brake. Also, they're made with large, heavy-duty carabiners for easy connection and safety! Add extra resistance to any exercise. Each bench comes with four of these, but additional bands can add resistance to your workout or increase the number of people that can train at once (with the PTbench or mobile group training).