12-Speed Chain .Durability Factor 5 .Perforated .Coated With A Diamond Pin Treatment That Provides Greater Shift Smoothness .Only 260 Grs.For 126-Step Chain .Compatible With Sram And Shimano 12-Speed Groupset .Not Directional .Measure 1, 2 ´´X 11, 128´´ .Includes Chain Attachment.