All our products are constructed with a durable, water resistant 420 denier nylon. We have a 1/2″ foam padding laminated to a slick nylon to create a lining that will slide easily on your harp. The zipper used is heavy-duty nylon (not metal) with our special self-closing back to keep the zipper away from the wood of the harp. Hand and shoulder straps are 1- 1 1/2 inch webbing.