This is the classic 81/85 Active Humbucking setup. The 81 utilizes powerful ceramic magnets and close aperture coils, this tone was designed with detailed intensity, incredible amounts of high end cut and fluid sustain. This pickup will make your leads slice right through even the densest mix. These pickups are triple wax dipped and vacuum sealed to eliminate any unwanted feedback and noise. The 85 is a powerful pickup with exceptional tone and versatility. Most often used in the rhythm position, the alnico magnets of this model provide a muscular growl and smooth lead tones to enable you to play with exceptional smoothness and soul as well as the muddiest of blues to the most extreme metal. Traditionally you use these, 85 "N", neck position and 81 "B", bridge position or set them up any way you like. Included with the set is as you see, wiring, input jack, screws, springs, pickup rings, one A25K and one B25K potentiometer's, a .047 Tone capacitor and the battery case, 9 volt battery needed for operation not included. These are comparable in sound and quality to EMG's so why pay the high price for the brand name when you can get the same thing at a more economical price. If you have any questions feel free to ask. Thanks for looking.