●Speeds: 6 Speed, 14-28 Teeth: 14-16-18-21-24-28T, Weight: 0.99lb(15.9oz). ●Cog Material: High tensile steel. The internal thread has high precision, smooth rotation and easy maintenance. ●Easy to Install: This freewheel characterized by smooth rotation without much noise. High precision internal thread ensures close connection with bicycle hub. ●Unique Sprocket: The sprocket combines a specially positioned shift ramp and tooth profile to improve chain control during shifting. ●Compatibility: Shimano and SRAM transmission system. Compatible with standard threaded bicycle rear hub. Suitable for MTB, BMX, E-bike, hybrid bike, fat bike, cruiser bike and so on.