Tunable timpanis also belong to the Orff-Schulwerk. The timpanis and the rotary timpanie are available with real calfskin or goatskin, or optinal plastic heads in most cases. Kettle drum are only available with natural skin. Natural skins have a warmer timbre than the somewhat dry sound of plastic heads, Plastic, however, has the advantage of constant pitch. It does not react hygroscopically and does not need to be returned after changes in temperature or humidity. All STUDIO 49 timpanis are made 100 % in Germany.