Black & white ebony with a CA finish and TGN finest badger knot that isn't set. I'm going to make another and pick the one I like more to permanently epoxy the knot in and PIF the other. I can't complain about this one too much, but B/W ebony is one of my faves so I'm biased.
@Quijote - that's funny @Lightcs1776 - a big thanks for the extra kind words @matwho - and a big thanks to you too, that's quite a compliment @Graydog - Thanks Steve. That's a 24mm, but the brush was drilled for a different 24mm with a significant glue bump so it will hold a 26mm knot. I didn't use the other knot for the pics because it's new and umbloomed and looked a little odd in the handle. If I decide to keep this one I'll probably put a TGN 26mm in it since I don't have one in that size yet.
@shipr - Thank You. I'm a big fan of a CA finish for its durability. It's usually used for a high gloss finish, but you can get a lower sheen by varying the technique.