The Coilology Prebuilt Performance Coils 7 in 1 Set is designed for high-performance set-ups within a collection of seven exotic coil configurations in pre-coils. Coilology introduces their prebuilt performance coils, now collectively in one pack. The Coilology Prebuilt Performance Coils 7 in 1 contains 6 individual coils in each pack in the Coilology Prebuilt Performance Coils 7 in 1 Set and 12 strips of organic cotton.