1、Constructed of high strength steel with hard chrome plating processing, sturdy, anti-corrosion, high performance of durability. 2、The inner thread is finished with high precision, which ensure close connection with the bike hub and smooth operation. 3、Providing fast riding speed with less effort needed. 4、Fluent turning movement without much noise.​ 5、Reliable to use, applicable to mountain bike freewheel.​ Features: Constructed of high strength steel with hard chrome plating processing, sturdy, anti-corrosion, high performance of durability. The inner thread is finished with high precision, which ensure close connection with the bike hub and smooth operation. Providing fast riding speed with less effort needed. Fluent turning movement without much noise. Reliable to use, applicable to mountain bike freewheel. Specification: Condition: 100% Brand New Material: Steel Color: Shown as pictures Treatment: Hard chrome plating Type:11 speed-11T Package Weight: Approx. 9g Applicable: Mountain bike freewheel, not applicable to highway freewheel. Packing Included: 1 * Freewheel Repairs Note: Before purchasing, please confirm whether your own flywheel can be used. Please purchase as needed.