RHK Chain 520 HD-X Pro Series 120L Gold Lightweight Ultra Narrow High performance exclusively designed for motocross and off road racing. Large Diameter Heavy Duty Pins, Chromium Carbide Teated for Strength with shot peened heavy duty side plates Pre stretched components for better performance and fewer adjustments Tensile strength 8,500 lbs Recommended for 2 & 4 strokes up to 500cc 70HP Premium Quality Made in Japan