Different Flux contents of Rosin Flux Core Tin Solder Wire - XF SOLDER Rosin Core Solder 0.6mm 1.7mm Solder Welding Wire 63/37 Rosin Flux T... - Grandado Kester 44 Rosin Core Solder New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). We recommend Kester 63/37 (63% tin / 37% lead) eutectic tin lead solder with flux type 44 at 66%. Middle of the road 0.031" diameter is perfect for general soldering See the seller's listing for full details., Brand: Kester, Container Size: ., 25 oz Kester 24-6337-0027 Sn63Pb37 Solder Wire, 1 lb Spool (.031 Diameter) Rosin Key Features: Alloy Composition: Sn63Pb37 (63% Tin, 37% Lead) Diameter: .031 (0.8 mm) Weight: 1 lb (approximately 454 grams) Package Type: Spool (SPL) Flux Core: 3.3% 44 Rosin Activated Flux Melting Point: 183° C 361° F Eutectic solder melt Solder Type: Activated Rosin Core Solder, Length: 6 Feet, Solder Form: Wire, Model: 44, MPN: 24-6337-0027 Packaging should be the same as what is found in a retail store, unless the item was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag.