Jayefo Boxing Training Heavy Duty Bag Spring for Hanging Boxing Punching Bags - Up to 210 Pounds - Black

It broke out and felt on may daugter head, she got a concussion.

Would not work for what I was trying to do

They are too stiff

Adding this helped lowering the noise of heavy bag when I kicked it. It minimized the vibrations which in turn lowered the creaking noises. This is a great, simple accessory to every heavy bag setup.

worked as expected. The open feel a little dangerous if a person we’re going to use metal to metal as their interface. I would wonder if with a lot of dynamic movement you might have a chain come loose. I used short pieces of webbing and a hitch to connect them as I hung up my hundred pound bag, so the weight of the bag is always tightening the knot. Other than that spring is great for 100 pounds probably more.