Stop uke tuner slippage problems forever. Set of 4 tuners, black finish, black butterbean (oval) style button, 4:1 gear ratio, all mounting hardware included. Smooth & stable tuning while maintaining the classic look of friction pegs. No slippage or need for tightening. Fits headstocks from 10mm to 12mm thick. Shaft fits a 9.5mm hole. Set weighs about 2 ounces.