Features: brand new and high quality Heat Resistance: This flywheel uses high-strength steel, has good corrosion resistance & heat resistance, and is for 10-speed HG system. Sturdy & Durable: This flywheel is made by tempering and quenching process, which has higher strength, durability and wear resistance, reducing the trouble of frequent replacement. Strong Oxidation Resistance: This freewheel cassette has strong oxidation resistance, is not easy to rust, and has a long service life, so it can be used with confidence. Hollow Design: This freewheel cassette uses a hollow design to reduce weight and will not add too much burden to your bicycle when used. Exquisite Appearance: The surface of this freewheel cassette is chrome-plated, and the surface is silver, and the appearance is exquisite. Specifications: Material: Nickel-chromium Steel Color: Silver Color Number of Sprocket Teeth: 25T/28T/30T/34T/36T Diameter: approx.13cm/5.11in Package Includes: 1Pc x Bicycle Flywheel Gear note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!