Kester 24-6337-0061 63/37, 44 Rosin-Core Solder,.062" Diameter Alloy: 63/37.Core Size: 66 Diameter: 0.062"Flux %: 66/3.3Flux Type: Rosin Lead-Free: NoTin/Lead Alloy: 63/37 Sn63/Pb37.062" diameter.44 rosin flux.3.3% flux