Features: 1. This speed flywheel can ensure an even rotation of the chain has a higher wear resistance high strength rust resistance and no deformation wear resistance and durability. 2. Made of high-quality metal corrosion-resistant and long service life.The internal thread has high precision smooth rotation and easy maintenance. 3. About the shifting performance we designed our tooth profile dedicatedly and use a narrow-wide tooth design to avoid the chain drop when back-pedaling. 4. This freewheel characterized by smooth rotation without much noise. High precision internal thread ensures close connection with bicycle hub. 5. Because the product uses a hollowed design it can not only increase the speed but also reduce the weight so that you can ride more smoothly. Notice: *Actual color may be slightly different from the image due to different monitor and light effect *Please allow 1-3cm deviation due to manual measurement Description: Number of tooth: As the picture shown includes: 1 pcs x Bike Freewheel "