
Wire is used to wrap around branches in order to allow them to be shaped and held in position while the form of the tree is stabilised.
The most common type of bosai wire used (for cheapness) is anodized aluminium wire which is brown on the outside with a silver "core". Alternatively annealed copper wire, which is more expensive and which needs to be heated to soften it, is used by the more experienced growers.
Bonsai wire comes in gauges a half millimeter apart from 1mm ranging up to 6mm and is generally sold in 500gram rolls (although smaller rolls of 100 grams are obtainable).
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