Wide Range Humbuckers are very unique. We had a plastic injection mold built to spit out the correct size bobbins for the correct size wire that was used in 1972 on the original. We do not use cunife magnets because it is no longer manufactured or available. The tone factor however does NOT come from the metallic makeup of the magnet but instead the actual strength of the magnet is what matters. We use a version of Alnico 2 and Alnico 5 threaded magnets. This is a big improvement from the cunife magnets. We use plain enamel or red poly wire to correct vintage spec.