There is no danger of this strap marking the finish of a prized acoustic guitar because we use no metal parts in it. These straps are beautiful, comfortable and durable. The Italian tanning process gives our leather its exceptionally rich color and texture. Additionally, the skins are tumbled for a supple, broken-in feel. These guitar straps feel like an old leather jacket. (You know, the one you can't seem to throw away.) Each strap is 2 inches wide and extra thick (5/32 inches), and the bottom edges are rounded for extra comfort and embossed with the DiMarzio® logo.