Thanks! The brush is a custom from Peter at Wolf Whiskers. The knot is a 25mm Black Wolf synthetic with 53mm loft. I can't really quantify the backbone in any meaningful way, but it's perfect for me. The handle is a custom mix of black, white, and silver. (Peter really went the extra mile to create what I had in mind.) I'm sure it's lighter than actual marble, but it feels quite substantial in hand. All in all, I couldn't be happier with it,That brush is so lovely! I can see how its mostly a match with that bowl too. Hey, back to the brush, love that marble looking handle, and I think you call that brush knot a tuxedo do you not? Is that a badger brush, or a synthetic? How's the backbone on that brush? Knot looks like 24 maybe 26. Loft looks like a 58 maybe? Does it have the weight of real marble, or does it feel light, like a resin handle? How do you like the brush?