I've been trying different PJ pickup combinations in my bass and these didn't work out for me. I bought them brand new and they were only in my bass for a few days before I took them out. The precision pickup is the standard model but the jazz bridge pickup has been overwound by 5% to give it some more volume to better match the precision pickup. The jazz pickup is a split coil design so it acts like a humbucker and won't hum when you solo it like some single coil jazz pickups do. They are great pickups and they are expensive too so this a great opportunity to get a like-new set at a great price. Feel free to ask me any questions and thanks for looking.