TINKSKY 4pcs Bed Sheet Grippers Garter Fastener Straps Elastic White Material: Hard plastic and soft elastic nylon.Length: 22.7cm. These handy sheet fasteners are just what you need to keep your sheets neat and secure in place. Lift mattress and fasten one clip to edge of sheet about 10-12 inches from corner of mattress. Great for bed sheet, satin sheet, mattress covers, blankets, etc