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These top floating pulleys are direct replacements for Shimano 7 or 8 speed pulleys. Washers included for other brands. Technical specs: 6061 T6511 tempered aluminum, anodized to MIL Spec MIL-A-8625E II Class 2 (all colors meet spec), precision NMB ball bearings with low friction lube. Saves pedaling energy and cuts chain noise. Patented design. USA. 23g. Colors Available: Blue, Silver, Green, Purple, Black, or Red.