Wood, brass wire dia 0.15 mm.
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This is a nice brush that matches the other Stahlwille file brush that I have. I notice that this brush is, first of all, compact. It's certainly long enough to get the job done, but the handle is shorter than other spark plug brushes that I've seen. Also, the bristles are softer than other brushes I've used...possibly because the material on the brush may be different. I actually like both of these distinguishing features, since I have other long brushes and brushes with rougher bristles. It seems well made, so no complaints there.
Cheap and functional
It's a brush. The only feature I would like to have seen is a hole on the handle for hanging.
Great little brush for various things. Price was right and the bristles aren't flimsy.
Stahlwille, IMHO, makes the best brushes around. I haven't used this particular one, yet, but I already know how great it will work.