3 on a plate, side fitting. Hauser pattern plates with ebony buttons. Gear ratio 1:16. Proven and unaltered in look and dimensions for decades. The worm gears and shafts used in our acoustic guitar machine heads are precision-manufactured and mounted with precisely the correct spacing on a warp-proof baseplate. The bearings are made of extremely glidant material, meaning that all moving components work absolutely free of friction and wear. 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.