The PROX Steel Valve Kit is crafted from high-quality nitrided steel and micro-hardened to reduce friction and wear. It boasts a longer lifespan compared to original valves, making it an optimal replacement for short-lived titanium valves. The kit includes a specially weight-adjusted steel valve spring set made from chromium-vanadium, ensuring extra high RPM resistance. Installation is straightforward and can be done without modifying any original parts. Ideal for those looking to enhance their engine's performance and durability.