500K push/push tone potentiometer for the following Ernie Ball Music Man guitars: Luke 3 (with push/push on tone), Valentine, JP13, JP15, JP16 and Majesty with version 1 preamps. Also used as push/push volume pot for the StingRay Short Scale bass. Note : Majesty v1 preamps have the mono/stereo mode switch on the piezo volume potentiometer. JP13 & JP15 potentiometers will need to be visually checked to determine, if the pots do not have the flex ribbon, it's a v1 preamp