The PROX Steel Valve Kit is crafted from high-quality, nitrided steel and micro-hardened to reduce friction and wear. This results in a longer lifespan compared to original valves, making it an optimal replacement for short-lived titanium valves. The kit includes a specially weight-adjusted set of steel valve springs made from chrome-vanadium, designed for extra high RPM resistance. It can be mounted without any modifications to original parts, ensuring seamless integration with your engine.