The Title Boxing Professional Industrial Quality Heavy Bag Spring - Up to 250 lbs. was designed specifically to hold professional heavy bags up to 250 lbs. for professional or home gym use. The all-steel springs help eliminate noise and stress on mounts and increases longevity of hanging chains and swivel. The industrial quality and all-steel springs are perfect for every heavy bag need you may have. Industrial quality all-steel springs are perfect for every heavy bag need. Helps eliminate noise and stress on mounts, and increases longevity of hanging chains and swivel. Recommended for all hanging heavy bags. For every heavy bag mounting from home to professional gym use. Recommended for all hanging professional heavy bags up to 250 lbs. 5" long.