These are Integrated Engineering valve stem seals for VW/Audi applications with 6MM valves. They are manufactured from high quality polyacrylic, for use with the intake valves only. They will fit several VW/Audi applications using the 6MM stem valves, like the 1.8T, 2.7TT, 2.0T FSi/TSi, 24v VR6, 3.2L VR6, may fit others.
About Integrated Engineering: Merging decades of experience with hundreds of hours of prototyping, engineering, dyno testing and daily usage evaluation has output exhaust systems that are the ultimate compliment to your performance car. IE products are proudly engineered, designed, and manufactured in-house, in Salt Lake City USA.