(taken from NUNO list) The copper wefts of this fabric are the very same material used in telephone lines; the polyurethane coating that protects against electrical shock and signal noise also happens to prevent 'greening' and brittleness, rendering it an ideal weaving thread. The warps are of Promix, a recently invented Japanese fibre regenerated from imported Australian milk casein powder and acrylonitrile. The resulting effect is a shimmery copper single weave fabric of a stiff quality.