17 mm Blend-Balance Guitar Potentiometer - PDB182-GTRBBourns PDB182-GTRB series dual gang, 17 mm blend-balance 'guitar pots'. The PDB182-GTRB series potentiometers are available in a two resistance values and with a centre detent as standard.Carbon elementKnurled shaftMetal bushing/metal shaftRear solder lugs250K and 500K standard resistance valuesStandard M and N taper