Regency's Bare Copper Wire is manufactured for grounding purposes in accordance with the National Electric Code. Conductor construction is soft drawn bare copper meeting the requirements of ASTM Specification B-3 and B-8. Gauge sizes 14 thru 10 are solid copper. Sizes 8 thru 2 are available in either solid or 7 stranded. Gauge size 1/0 thru 4/0 is available in either 7 or 19 stranded.