This Service Rifle Sling is made from Biothane. Leather cracks and stretches, but the Biothane material is almost indestructible regardless of the weather or conditions. Biothane is made by fusing a polyester web inside a urethane casing which makes an extremely strong sling. This material is extremely comfortable in any shooting position and wraps around the arm perfectly. This sling is approved for civilian Marksmanship Program (CMP) matches. It includes two Biothane keepers that do not move when put in place. Hooks are made of steel and are riveted on with 3 rivets. The sling measures 54", which will accommodate almost all shooters. This is also an excellent sling for tactical shooters because the material makes the sling extremely quiet.