Heavy brass valves were an obvious starting point. Used for about 150 years, some manufactures had already tried lighter materials with plastic coatings, but heat expansion caused sticking, and they lost interest. Helmut Finke was not so easily discouraged. After input from the Bielefeld Engineering Institute, and some intial upsets, he suceeded with the design of a non-expanding synthetic rotor bonded to a stainless steel shaft. So, since the early 1970`s when synthetic rotors were first introduced, our materials and design has continuously evolved. Today we employ a carbon fibre used by the aircraft industry to replace metal. It melts at 370 Centigrade; a temperature which even the most stressed player will not reach! Finke players all over the world are testament to the suitability of our approach.