I’m not sure- I noticed the white fluff coming off when I used them and then never bothered with them again.
Haha been some years since I have seen a chamber brush, my son got all of my left over kit.
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Hi Tamiya makes 2 wire brushes for their airbrushes and they are great on any airbrush, the small one is great to pop in front of brush and goes right up for a good clean and the bigger one I use to poke down bottom of paint cup to clean in the chamber. Cheers.