The PROX Steel Valve Kit is crafted from high-quality nitrided steel and micro-hardened to minimize friction and wear. This results in longer-lasting performance compared to original valves, making it an ideal replacement for short-lived titanium valves. The kit includes a specially weight-adjusted steel valve spring set made of chrome-vanadium for exceptional high RPM stability. It can be installed without modifying original parts, ensuring a seamless fit and superior durability.