Stackable sprockets with single freehub designed for Shimano® 11-speed transmissions. Manufactured in steel with matt chrome finish. The end sprocket is manufactured from CNC-machined AL 7075 T6 aluminium alloy with Hard Treatment anodization. The locknut features a black finish.Specifications:- Weight (g): 242 (12/25)- Middle position sprokets teeth: 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 29- Pole position sprockets teeth: 11+12 / 12 / 13 / 14 / 15 / 16 / 18- Middle sprokets material: Steel matt chromed-plated- Last position sprockets teeth: 25 / 27 / 29 / 30 / 32 / 34- Lock ring material: AL 7075 T6 / Black anodization- First position sproket material: Steel matt chromed-plated- Last position sproket material: AL 7075 T6 / HT hard treatment