1. Our gangbicycle cassette is made of highquality steel material, which is resistant to high temperatures, corrosion, rust, deformation, wear, high durability, good impact resistance, high tooth form precision, lost tooth design, strong compatibility, makes riding more possible. 2. Ensures smooth acceleration and precise positioning within the gear range, whether you are dealing with steep climbs or unevenness on flat roads, this bicycle cassette can provide efficient power transmission and reliable shifting. 3. The bicycle flywheel is made of nickelplated steel sheet with highstrength, multilayer galvanization and rustproof treatment. 4. The bicycle flywheel rotates smoothly and quietly and can directly replace the old or damaged flywheel. 5. Strong compatibility: This flywheel has highprecision tooth form and strong compatibility, which makes riding easier. 6. Hardening technology: The bicycle's flywheel is made of highstrength steel, which has higher wear resistance and durability through hardening technology. 7. Excellent performance: High temperature resistance, corrosionresistant, rust, no deformation, high durability, good impact resistance. 8. Hollow: It can easily reduce weight, reduce riding load, and achieve a good balance between strength and weight, an ideal choice to reduce the weight of bicycles.