The Hippo Swivel Clip Tarp Weight is made of a heavy-duty nylon material that resists cracking even at 45 below zero! The swivel action is equipped with a standard, threaded bottle cap allowing the user to create a heavy duty tarp weight. To use, simply fill any used plastic container with water, twist on the Hippo Tarp Weight and then clamp onto any tarp. Use For: Tarps, awnings, pool covers, canopies, plastic sheeting, camping, boating, RV, hunting, fishing, gardening, construction, work shelters and much more.