ITEM NAME:0.7mm 63/37 New Welding Iron Wire Reel Tin Lead Line Rosin Core Solder Wire FT Specifications: Trustable factory produced, brand new 63/37 rosin core solder FLUX 2.0% wire diameter: 0.7mm Melting point: 361Â °F/233Â °C total wire length of one reel: approx 1.7m.Total wire length of one reel: approx 1.7m.