24Pcs Shaft Metal Potentiometer Control Knobs 6Mm,Black Guitar Pedal Knobs,Dimme 313047053039 | eBay
Magpie Aluminum Knob, Silver – Guitar Pedal Parts
Amazon.com: DaierTek Guitar Effect Pedal Knob Metal Black Potentiometer Knob Anodized Aluminum Amp Pot Knob with Set Screw 1/4 -13Pack : Musical Instruments