This is a Filtertron-type humbucker. The resistance is approximately 4.2kΩ, designed to be similar to a Gretsch Filtertron. You can see the magnet from the back, and it appears to be an Alnico magnet. The size seems to differ from a Gretsch Filtertron, and it's closer to a mini-humbucker size. Comparing it to my mini-humbuckers, this one is slightly larger. The lead wires are about 25 centimeters long. It was installed on a guitar I purchased used, and the manufacturer is unknown. Also, I haven't been able to confirm the sound output yet.