I came across this AOS brush that my son gave me years ago. I think it's a pure badger knot. Here is a picture of it sandwiched between a Wee Scot and a 28mm Chief. You can see that it isn't much larger than the Wee Scot. Very little backbone. You could almost say somewhat floppy. Now look at the lather it created: Incredible, right? This brush, bowl-lathered Krampert's Bay Rum soap like a champion. Size really doesn't matter. Does it matter to you?