Features: High strength center lock structure, which can provide strong braking force even during intenses cycling and avoid the influence of rotor stress. The bike disc brake Rotor is make of Aluminum alloy and high carbon steel, with high strength, not easily to deforms, and excellent rusts prevention and wear resistance. The polygonal airflows designs and large hole spacing provide good heat dissipation performances and reduce brake attenuation and warpage, thus ensuring excellent brake performances. Excellent dry and wet performances, good wear resistance, quickly ventilation and good heat dissipation. Used as front disc brake bike and rear disc brake bike, easily to install. Specifications: Materials: Aluminum Alloy and High Carbon Steel Style: 140mm A/160mm B Color: Black/Red/Purpleness/Pink A Diameter: about 140mm/5.51inch B Diameter: about 160mm/6.3inch Package Includes: 1pc Bike Disc Brake Rotor note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!