This document is an introduction to a catalog from MAHLE that contains information about valves, valve guides, and valve seats. It provides an index and table of contents for the catalog sections. It also lists additional catalogs available from MAHLE and technical information catalogs on pistons, rings, filters, and gaskets. The introduction describes MAHLE as experts in internal combustion engines and components who supply many original equipment manufacturers. It notes their research centers and over 66,000 employees worldwide.