Our cassette are well designed with features of convenient loadouts, fast braking response, smooth gear shifting, and higher power output. The cassette is connected to the hub through a slot, enabling high strength to withstand vigorous pedaling. The cassette is matched with the chainring, making the gear ratio larger to meet different riding needs. Our cassettes are primarily made of chromium-molybdenum steel and forged aluminum alloy with the feature of good mechanical properties. Chromium-molybdenum steel is an alloy steel mainly composed of chromium and molybdenum elements combined with iron and carbon and has the characteristics of high strength, high hardness, high wear resistance, fatigue resistance, and good quenching property which helps to improve the overall strength and hardness of the cassettes. Aluminum alloy forging material is characterized by light weight, high strength, strong corrosion resistance, high strength and excellent durability, ensuring the stability and safety of the cassettes.