Untreated beechwood, 6.5 cm
My brush also cracked immediately (in two places), within a couple days, despite letting it dry between use. I wondered if it may be a defect, but am seeing others with the same experience.
I just received my brushes and tried them out yesterday for the first time. Once I was done I placed them face down on a rack to dry. The next day I saw a crack down the middle. Perhaps the one I received had a defect, but it seems to me the wood is quite sensitive.
Great brush for scrubbing pots and dishes. Also lasts a really long time.
Not the the first time I’ve bought, been using them for years.