The thickness is 5.9 mm +/- 0.3 mm (quarter inch). No, they don't all look alike! Being flat is more important that every comb being exactly the same thickness. All combs within that range have the same tone and response.
I recommend these tools for every player:
Basic Tool Kit
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Andrew Zajac, Kingston Ontario, Canada.
I use a continuous quality improvement process. I use regular evaluation and incremental steps to strive for constant improvement.
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