The Billingham SP40 tan leather shoulder pad features a leather upper surface that is bonded to a core of high density, closed cell foam into which we have engineered precise grooves to allow it to mould to your shoulder. Next, we found a new type of rubber that provides improved grip, so the whole thing stays put. Finally, heavy-duty press studded guides help to restrict any lateral movement of the shoulder strap. The SP40 will fit a 1.5-inch sling.