Pack of MTB 11-51 sprockets designed for Shimano ®/SRAM® 12-speed transmissions. The structure features nine single chainrings made of special high-resistance steel with matt chrome finish. The last three sprockets are machined from solid and form an AL 7075 T6 aluminium alloy monoblock with Hard Treatment anodization. Six screws facilitate engagement of the sprocket. The weight of the cassette is 486 g. The locknut features an anthracite finish.