This is an EMPTY ToneStorm cartridge, half size, capable of holding one humbucker or one single coil pickup, either active or passive. It can be used in either 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 "Transforma Series" guitars.