Bare copper wire 250g roll - measured by mass, lengths are approximated 28 SWG (29/30 AWG) - 0.0148" (0.38 mm) Dia. Approximate length is 800 ft. Includes: 1 Spool Copper Wire, Bare, 800ft Reel, 28 SWG (29/30 AWG) - 0.0148" (0.38 mm) Dia. 250g roll - measured by mass, lengths are approximated