item #: A-160 1/21 copper bamboo content: 67% bamboo, 33% copper yardage: approx. 650 yds. (585 mts.)/oz. (28 gm.) regular price: $16.20/oz. (new price from 2/10/2007 - if you placed an order before the 10th, you will be quoted an old price.) unit size: from 1/2 oz. weight: lave/weaving suggested epi for weaving: N/A suggested needle size for knitting: US no. 1-3 for single or double strand suggested needle size for crochet: N/A We call this COPPER-BOO! This is an opposite of silk or wool stainless steel yarns. The fine copper wire is wrapped around the bamboo core. Because of the bamboo, the yarn is still very soft, but can keep the shape because of the copper. Not so strong as a warp yarn for weavers, please keep it to weft.