Bare copper wire 250g roll - measured by mass, lengths are approximated 18 SWG (16/17 AWG) - 0.048" (1.2 mm) Dia. Approximate length is 80 ft. Includes: 1 Spool Copper Wire, Bare, 80ft Reel, 18 SWG (16/17 AWG) - 0.048" (1.2 mm) Dia. measured by mass, lengths are approximated