Price is for 12 x Ferrea COMPETITION PLUS VALVES - Intake. Please select from the option menu if you want the Standard size OR 1.0mm oversized Ferrea Competition Plus Intake Valves Ferrea "Competition Plus" super alloy valves represent the highest level of sophistication in valve technology. Ferrea proudly introduced the next generation of extreme heat resistant valves, specifically developed to withstand the brutal punishment of NHRA Top Fuel and Funny Car applications. They have developed a specially processed high nickel-based alloy, and a unique heat-treatment process, which yields extreme heat resistance and enormous tensile strength properties, (far beyond conventional Inconel materials). These extraordinary valves will set the standards for all Supercharged, Turbocharged, Nitrous Oxide, Off-Shore Marine, or 9.0 compression restricted race motors. Many Top Fuel Dragster and Funny Car teams can confirm the performance and reliability of these new valves which are now available for many engine conbinations including, NASCAR, Sprint Car, Drag Race, and Off-Shore Marine applications. These valves are specially designed for use in racing engines that are subjected to extreme exhaust temperatures such as turbo, nitrous, or supercharged racing engines. No other valve on the market has been designed specifically for these applications. Once again, Ferrea is setting the pace.