About this item Material: anodized aluminum alloy, use for Shimano Campagnolo 7 8 9 10 11 speed cassette freehub conversion, buttom bracket BB adjustment. fit 10 speed cassette to 11 freehub, fit 7, 8, 9 speed cassette to 10 11 speed freehub, fit 7 speed cassette to 8, 9 speed freehub. fit BB bottom bracket adjustment spacer. Color: Black. Included 2x 1mm, 2x 1.5mm, 2x 2mm, 2x 2.5mm, 2x 3mm spacers.