DC Audio Level 2, 2 ohm dual voice coil. Magnet barely fits and if I remember correctly it specs a slightly larger air space for a ported enclosure. It’s rated for 600 watts but I’ve been giving it 900 watts reliably for some time now.
I tried beads in my beadlocks...huge mistake. I spent a week trying to be optimistic, they would be smooth sometimes but then hit a bump and way out of balance again. Snake oil IMO, had to break the bead and vacuum them out and go get them balanced in the traditional manner.