The PROX Steel Valve Kit boasts superior quality nitrided steel construction, which is micro-hardened to significantly reduce friction and wear. These valves offer enhanced durability compared to original valves and are an optimal replacement for short-lived titanium valves. The kit also includes a specially weight-optimized steel valve spring set made of chrome-vanadium, ensuring extra high-speed resistance. Installation is straightforward as no modifications to original parts are required.