This is an EMPTY "Transforma Series" cartridge, half size, capable of holding one single-coil or humbucker pickup, either active or passive. It can be used in the neck or the bridge position. You do not have to do any soldering, just a simple small screwdriver will attach your pickup wires to the terminal strip and away you go! Wiring diagram is included. WILL NOT fit in our "ToneStorm Series" guitars.