The best nut in existence!
Bell brass is absolutely the best material for a nut for a crisp and solid sound, extremely recommended for death metal.
Warwick shows that the slot takes strings up to 0.114, and included instructions to use a 3.1mm file to easily fit up to 0.121, as i did and it worked like a charm.
I used it to upgrade my BTB bass, along with warwick brass frets,
it's expensive but definitely worth the money. Brass is eternal.
Pros - crisp sound, amazing resonance; Easy install; height adjustment screws make action adjustments easy!
Cons - price; Much more expensive than ABM brass nuts.