●500pcs per pack. ●Open Serrated Seals For Polyester Strapping Clips are made of zinc plated steel. ●Open Serrated Seals is created to ensure that clips stay closed every time. Achieve the most secure seal with this new, The combination of the two serrated edges results in a strong and durable seal ●Open Serrated Seals For Polyester Strapping Clips Open serrated seals for polyester strapping clamps, to be used in conjunction with strapping clips. ●The Open Serrated Seals For Polyester Strapping Clips are designed to work for all 1/2” width polyester strapping.