These high-quality black Gewa straps are designed for any violin or viola case with D-rings for back pack style carrying. When you order you get 2 straps with neoprene padding measuring 19 inches in length. 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 24 to 31 inches assuring comfort. Please note that these straps are not designed for cello cases but are specifically made for violin and viola size cases.