The PROX Steel Valve Kit is crafted from high-quality nitrided steel that is micro-hardened to reduce friction and wear. This ensures a longer lifespan compared to original valves and makes it an ideal replacement for short-lived titanium valves. The kit includes a specially weight-balanced set of steel valve springs made from chrome-vanadium for extra high RPM resistance. Additionally, it can be installed without any modification to the original parts, making it a convenient and reliable choice for engine enhancement.