These chains are designed, tested and manufactured exclusively for Motor Factory® to comply with the performance demands of Harley-Davidson® motorcycles. Engineered to exacting standards to guarantee long life and smooth operation. Aligned and seated pitches eliminate initial stretch and early wear. Tight precision assembly withstands high impacts and resists kinking. Shaved plate holes eliminate tapering and hairline cracks, ensuring even distribution of stress. Made with case hardened pins, wide side plates, and premium bushings. MTF O-Ring Chains - 20,000 mile Limited Warranty against defects in materials or workmanship. One Year Warranty against defects in materials or workmanship.