1.Special selected Spring Wire 2.Withstand wind up to 117Km/h 3.UV stablized Plastic ... system, with our well designed Lockup steel or aluminum proifle, 2.it can withstand 120 km/hour wind. It is made ... polylock base during film installtion. VINPET:PE Coated Dia2.0mm,2.2mm,2.3mm,2.5mm Wiggle Wire Spring For Greenhouse