The Hippo Swivel Clip is made of a heavy-duty nylon material that resists cracking even at 45 below zero! Not just for fastening tarps - this handy tool is only limited by the imagination. Use For: Tarps, awnings, pool covers, canopies, drop cloths, plastic sheeting, tablecloths, tent repair, pet food bags, snack bags, golf towels, camping, boatig, RV, hunting, fishing, gardening, construction, work shelters and much more.