Legendary Schaller M4 quality at a stunning 40% less weight. 1:20 gear ratio. Weight 42g. A special female screw guarantees precise positioning and fixing of the shaft. All sealed tuners are lubricated with Schaller special grease for lifetime maintenance-free service. All parts are precision-crafted and surface-finished, the self-locking drive ensures an even, delicate and steady tuning. All string posts are made of high-grade brass and fitted into the housing with utmost precision, ensuring the best possible tuning accuracy and wear resistance.