Mostly enamelled copper. Comes in many colours, thicknesses and coil/spool lengths. hints uses and examples here Gauge II   (0.315mm):   10 m / coil Gauge III   (0.50mm) (fine-medium):   2 m / coil Gauge IV   (0.71mm) (medium):   2 m / coil

Some gauge III examples are shown below the table.

Gauge	diameter (mm)	swg	Metres / coil	Colours
II	0.315	30	10	Opaque Purple, Dark Purple, Mauve, Mid Brown, Black, Wine, Ivory, Gunmetal, Opaque Blue, Vivid Green, Opaque Green, Leaf Green, Dark Blue, Supa Blue, Supa Green, Supa Violet, Pink.
III	0.50	26	2	Suppa Green, Opaque Blue, Warm Gold, Bright VIolet, Green Charteuse, Black, Dk Blue, Pink, Supa Violet, Dk Purple, Rich Gold, Mid Brown, Gunmetal, Vivid Green, Mid Blue, Lire Gold, Leaf Green.
IV	0.71	22	2	Gold, Dk Blue, Leaf, Brown, Gunmetal, Supa Green, Supa Blue, Warm Gold, Dk Purple, Vivid Green, Supa Violet.

Above: Warm Gold Gunmetal

Above: Dark Purple Supa Violet

Above: Vivid Green Supa Green

Above: Bright Violet Pink (brighter in reality)

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