Supply of Modified Guide Assembly For Brake Gear Arrangement For Wap4 Locos To Rdsos Drg. No.-Skel-4558 Alt.-0 Material Specification Of Ref. -5 & 6 Only Should Be Nylon- 66 Tensile Kg/Cm-840/980, Hardness Durometer- 80/85, Specific Gravity-1.15/1.16..