Feature:1. Made of high-quality metal, corrosion resistance and heat resistance are good, so there is no need to worry about long-term use of friction and heating, which will affect its service life.2. High-strength steel, made by tempering and quenching process. Therefore, it has higher strength, durability and strong wear resistance.3. The black adopts plating technology, exquisite appearance, giving you a luxurious feeling4. Strong oxidation resistance, not easy to rust, and long service life. Hollow design reduces weight.5. Easy to install and remove, without any professional requirements even though you are an amateur.Specification:Item Type: Bike FlywheelMaterial: Chrome-Molybdenum SteelColor: BlackWeight: Approx. 611g / 21.6ozGear Ratio: 11-13-16-20-24-28-34-40-46TCompatible: for HG Mountain Bike Package List:1 x Flywheel2 x Sprocket1 x Flywheel CoverNote:After the installation is complete, check whether the flywheel is locked and whether it is aligned