Anodized Aluminum 1.5mm Bonsai Training Wire 250g Large Roll (170 feet) - Choose Your Size and Color (1.5mm, Brown)
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The drainage mesh used by Grow A Bonsai Tree has holes only measured in terms of it's diameter. The soil loss should be kept as low as possible while still allowing effective In the end, a 1 is probably what you need. The diameter of 5mm wire is A thickness of zero mm or two mm is acceptable. If you are using 0mm, this should work as well.
You can read it here. There isn't a particular gauge that should be used. It is not necessary to pump too much air through a gauge that is too thin, nor should you pump too much air through a gauge that is too thick. It is my hope that this will be helpful.