Bourns Model 95 Premium Guitar Potentiometer, 500K Linear, Knurled Split Shaft Premium guitar pots with long-life and extremely low noise. Conductive polymer element, Low roll-on, low noise, Long rotational life 1/4" Knurled Split Shaft, 3/8" Bushing Width, 3/8" Bushing Length Tolerance: 20 %, Very low noise, Power Rating: 0.25 watt Bourns Series Number: 95A1D