It is made of polypropylene or nylon material, to be used to fix the insulation board with a good property of high strength, anti-aging, heat proof and cold proof, easy for construction. (Recommended application): Exterior wall heat insulation system Normal specification Diameter 10 x 70mm, Plastic core, As per customers requirements Diameter 10 x 90mm, Plastic core, As per customers requirements Diameter 10 x 110mm, Plastic core, As per customers requirements Diameter 10 x 130mm, Plastic core, As per customers requirements Diameter 10 x 160mm, Plastic core, As per customers requirements Diameter 10 x 200mm, Plastic core, As per customers requirements