Boss FV-500H Mono High Impedence Volume Pedal Portable Recorder Accessories and the triangular cast base

and the triangular cast base provides maximum stability

Diaphragms active diameter 27 mm

John McVie of Fleetwood Mac

and no fussing

Boss FV-500H Mono High Impedence Volume Pedal Portable Recorder Accessories and the triangular cast baseBoss FV 500H Mono Volume Pedal Stylish design, a road tough build, and comfortable, smooth action. Expression output for use with expression compatible amps, effects, and even synthesizers. Features: Mono, high impedance volume pedal Heavy duty aluminum die casting body Ultra smooth pedal movement for the utmost in comfort and control Rubber pedal for comfortable play and non slip action Expression pedal function Convenient tuner output jack