The Sure-Lock II Weigh Pouches work with soft or hard lead weights. The Sure-Lock is easy to load and remains secure until you want to release it. The Sure-Lock Weight Pouches align themselves. Just insert the pouch until it "clicks". A simple, single pull release is all that is needed to jettison the weights in an emergency. Pouches have a hook & loop fastener to secure weight (s) in pouch. Pouches are made from durable nylon fabric with taped and sewn edges and impact resistant plastic components for added strength and durability.