Vortex Racing EK 520 SRX2 Clip Master Semi Press 112 Links- NaturalThe EK SRX2 Series Chains feature advanced QX rings that outperform factory O ring chains. Laboratory tests have demonstrated that QX rings reduce friction by 40 percent, extending chain lifespan by up to 50 percent compared to traditional O ring chains. Additionally, weight saving holes drilled into every other chain link minimize rotating mass without compromising strength, enhancing horsepower delivery to the rear wheel and improving throttle