... .Strengthen cord is stainless steel,\ A)Specification: XL, L, H, XH, T5, T10, T20, AT5, AT10, AT20, 3M, 5M, 8M, 14M ... ; B)It could be reinforced by steel wire core or kevlar ... characteristics of the load force. PU Synchronous Belt, Transmission Belts (XH)