Motorcycle Transmissions Gear & Chain Kit with Rollers Sprockets for Durable Performance. Extended Lifespan Design: SFR Super O-Ring chain offers 150% lifespan compared to ordinary O-ring chains. Comprehensive Color Options: Available in Silver outer with black inner, and Golden outer with black inner configurations. Robust Material Construction: Manufactured from high-strength Alloy Steel with tensile strength of 20.6 kN. Certified Quality Standards: ISO9001:2001 and CE certified with 100% visual and function inspection. Flexible Customization: Accepts OEM/ODM, full customization, and minor customization from samples or designs. Multiple Row Configurations: Available in Single, Double, and Triplex row options for various transmission needs. Diverse Surface Treatments: Options include Zinc Plated, Gold Coated, and Copper Coated for enhanced durability. Global Manufacturing Capacity: Monthly output over 2.2 million pieces from four fully owned factories.