4-Pack 20mm Diam. Set Screw Style Aluminium Potentiometer Knobs 1/4" Universal Pot Control Knobs with Indicator for Guitar/Bass/AMP Amplifier Black with Indicator Line music_update_2020 and input voltage is 24V

and input voltage is 24V

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It has hard plastic

It also work with smart phones

The four graduated scales include a 0

4-Pack 20mm Diam. Set Screw Style Aluminium Potentiometer Knobs 1/4" Universal Pot Control Knobs with Indicator for Guitar/Bass/AMP Amplifier Black with Indicator Line music_update_2020 and input voltage is 24V4 Pack 20mm Diam. Set Screw Style Aluminium Potentiometer Knobs 1 4" Universal Pot Control Knobs with Indicator for Guitar Bass AMP Amplifier Black with Indicator Line 4 Pack 20mm Diam. Set Screw Style Aluminium Potentiometer Knobs 1 4" Universal Pot Control Knobs with Indicator for Guitar Bass AMP Amplifier Black with Indicator Line Product Features Dopro CNC machined universal 1 4" innder diameter knobs with set screw; Compatible with most solid