Part number Material inish Weight (g) carbon / glass fibre / Kevlar black carbon / glass fibre / Kevlar black atalogue 018ģ Square design hinges with countersunk holes inges are made of 30% polyamide, pins are in 304 stainless steel. The Kevlar fl ex units are impregnated with a fl exible urethane. The rigid leaves are a glass fi bre carbon hybrid. 2 arbon Kevlar hinges arbon Kevlar hinges arbon Kevlar hinges with glass fiber - 50 mm width inge is constructed of rigid leaves and a fl ex unit.