The PROX Steel Valve Kit represents high-quality craftsmanship made from nitrided steel. It is microhardened, thereby reducing friction and wear. This kit offers longer durability compared to OEM valves and is an ideal replacement for short-lived titanium valves. Included in the kit is a specially weight-optimized steel valve spring set made from chrome-vanadium, delivering extremely high RPM resistance. The kit can be installed without modifications to original parts, making it a convenient and efficient upgrade for your HONDA engine.