Solderless P Bass Harness Alpha A250k Solid shaft pots. Volume pot has a treble bleed circuit. The tone pot has 2 settings: Turned all the way up it lets the mid range come through, in the middle it's your normal sound. When you turn it down to 0 it cuts the treble and mids. It comes with instructions for installation. Items that have been soldered on are not returnable, please contact me if you have a problem oncean item has been soldered. All pots and switches have been treated with a conductivelubricant to prevent moisture damage and crackle in the pots. I don't like to bore people with my life history butI have been playing guitar and bass for over 30 yrs. My father was also aguitar player and his band opened for the Allman Brothers , GratefulDead, Jimi Hendrix, Procal Harum, Captain Beefheart, 13th Floor Elevators andFleetwood Mac with Peter Green etc. I put as much creativity and innovation in thepickguards that I make as possible making each one different and adding featuresthat allow you to get as many sounds combinations as possible.