The 24-9574-7611 from Kester is 18 AWG, 19 SWG lead free no-clean flux wire solder with Sn99.3Cu0.7 (99.3/0.7) composition and 0.040" (1.02mm) diameter. This wire solder comes in 1 lb (454 g) spool. Storage/refrigeration temperature range is from 50°F to 104°F (10°C to 40°C).