This is an EMPTY Transforma series cartridge in full size for our aluminum-bodied modular guitars. It is capable of holding two humbuckers, two or three single coils or a combination of single(s) and humbucker. You can install any brand of passive or active pickup, just let us know what holes (pickup configuration) you need and what color top plate. No soldering is needed, just a simple small screwdriver will attach your pickup wires to the terminal strips. Wiring diagram is included. WILL NOT fit in our Tonestorm series wood-body guitars which have their own cartridges.