Bare copper wire 250g roll - measured by mass, lengths are approximated 24 SWG (23/24 AWG) - 0.022" (0.56 mm) Dia. Approximate length is 375 ft. Includes: 1 Spool Copper Wire, Bare, 375ft Reel, 24 SWG (23/24 AWG) - 0.022" (0.56 mm) Dia. 250g roll - measured by mass, lengths are approximated