The OPUS-3 is the latest of premium products released
into our OPUS line of pickups that we believe to be “Better than Hand-Wound”. This pickup is an old gibson / epiphone
style mini-humbucker that features clear and clean middle
tones that are tender and sweet yet bright and strong. The bridge pickup is wound about 15% heavier than the neck
pickup thus creating the perfect balance in sound and tone. The OPUS-3 pickup is carefully made with heavy formvar
copper wire and alnico magnets. The coils are wax potted
for stabilization to insure the complete clean reproduction

http://www.tesla-pickups.com/shop/item.php?it_id=1461576249