ZTTO MTB Bike 11 Speed Cassette Color: Silver/Black silver Spacer Material:Engineering Polymers Lock Ring:Steel / Red Ano. Ratio: 11-13-15-17-19-21-23-25-28-32-36T(11-36T) 11-13-15-17-19-21-24-28-32-36-40T(11-40T) 11-13-15-17-19-21-24-28-32-36-42T(11-42T) 11-13-15-18-21-24-28-32-36-40-46T(11-46T) 11-13-15-18-21-24-28-32-36-42-50T(11-50T) 11-13-16-20-24-28-32-36-40-46-50-52T(11-52T) Support HG freehub only High tensile steel The material of high tensile steel made by the technology of quench-temper hardening, makes it more durable and has extreme resistance to abrasion. Hollow design *We adopted the hollow design to reduce the weight to some extent. *The surface made by the technology of chrome plating, makes it hard to rust and provides a long service life. And the surface of black-silver has a fine appearance and will give you a luxurious feel.

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