Golden Gate FM-20 Embossed F-model Mandolin Tuners - 2 planks (4+4) - Nickel Two period correct 1920's style reverse gear F-style mandolin 4-on-a-plank tuners offer unsurpassed tuning stability Precise 14:1 ratio with hardened steel worm gear ensures years of accurate intonation and tuning stability Triple nickel plated gear plate shaped and embossed with Art Deco motif Small oval-shaped removable pearloid buttons are comfortable to hold and look great To learn more, please see our Product Description below