Designed to secure greenhouse film and shade cloth to steel or aluminum hoops this 40-pack bundle contains 40 aluminum alloy U-channel strips paired with 40 Pe coated spring wires each 6.56 ft long. The wiggle wire drops into the channel and pinches fabric in place creating a fast reversible grip that will not tear the film. Pe coating prevents rust and shields covers from metal abrasion while the aluminum alloy channel resists corrosion outdoors.