Such as those with ceramic bar magnets on either side of the slugs, or the ones with the single bar embedded, or the large bar stuck to the bottom. Cheap, people throw these away, post to FleaBay, loaded pickguards reverbErating everywhere. But they actually sound pretty good, especially the older ones where the wire was mostly copper. After trying alnico, even quarter pounder, I prefer ceramic for the higher output and deeper tone. And I am liking the definition for fast chords, the nastier pick swipe that single coil into distortion provides. This mod works fine for alnico too, but you'll want to replace mags with slugs. That is, if I can "induct" you into following this idea. So simple, so awesome for high gain: Start with a stock Squier original matched that have the reverse wound, reverse pole middle pickup. Buy a three position switch. Pull the magnet(s) from the middle pickup. Xacto knife will do it unless embedded. Leave the slugs. Wire it up for the "Dan Armstrong's A More Versatile Strat" mod from Guitar Player, 1987 But now that the middle pickup is a "dummy coil" we use a three position switch No need for the middle pickup lead to the selector Quack is fun, but a lot of us seldom use the middle one. Wire in the neck and bridge Lose the remaining tone control, or keep it if you like. I shift volume blend pots down a spot Gets volume out of the way of picking Fill hole with "Morris 22384 Plastic Knockout Plug, 3/8-Inch, Black, 10-Pack" Night and day for hum cancellation. It's still slightly there, not 100% gone like the commercial solutions. But it totally works and only cost your time. There is slight treble loss but I like the sound, and the blend pot is there to bring back the treble as you like it.