These high-quality black Gewa straps are designed for any cello case with D-rings for back pack style carrying. The auto-clip type buckles mean that these straps will not slip off your case until you want them to. The length of each strap adjusts from 20 to 37 inches assuring comfort. The neoprene padding is widest at the shoulder and tapers at the end for more comfort on the shoulders. Please note that these straps are designed for cello cases.