Plastic Knobs/Potentiometer Knobs/Rubber Knobs With Soft Touch Feeling We can supply shaft hole as 4mm, 6mm, 6.5mm, ect. Plastic Knob/Potentiometer Knob/Color Knob Item No.: 1052Material: Plastic Color: Red, Yellow, Green, Bule, White on your requestOperating Temperature: -30oC to 50oCFor 18 sawteeth 6mm shaft potentiometers