520 GMX/520 GMXL Racing Chains are specifically designed for Motocross and Supercross. Race tested by factory riders to meet today's high performance machines. The 520 GMX can be used for all sizes of machines. The 520 GMXL is a lighter version for 125cc and 250cc four-stroke machines. Both chains feature high-tech CRH coated pins for extremely hard outside surface and softer inside to increase the impact strength. Chains are available in standard natural or gold finishes. It is a non O-Ring chain. Tensile strength = 8 400 lbs. It has 120 links with 520 GDO clip-type links. The GYTR O-ring chain is manufactured by the inventor of the world's first O-ring. The finest O-ring chain on the market is ideal for small and mid-sized off-road motorcycles, sport bikes and ATVs.