Back in the early 80's adding a humbucker pickup to a Strat™ took off. Since then we've added just about every conceivable combination you can think of, and they're all available factory pre-wired. The S/S/81 brings together the classic 81 with two ceramic magnet loaded single coils for a combination that is both aggressive and articulate. Once you've decided on the system you want, it can either be fully or partially assembled depending on your guitar and the sound you want. Since all EMG's use a solderless wiring system, you can change your pickups easily at any time without any soldering.