... . 2.Strengthen cord is stainless steel, and Kevlar A)Specification: XL, L, H, XH, T5, T10, T20, AT5, AT10, AT20, 3M, 5M ... in short time, can be combined with other thermoplastic materials. H)Hard to be hydrolyzed, anti- acid, UV resistant, not aging ... of the load force. Rubber Timing Belt, Rubber Synchronous Belts (H)