Kester 44 Rosin Core Solder 63/37 .015" 1/2oz Dispense-Pak Specially packed by CML Supply from Genuine Kester 24-6337-0007 solder 1/2-Ounce pocket size pack contains approx 56 feet of solder! 67/37 Tin/Lead is most common for electronics work .015" Diameter is most common for fine-pitch electronics work High activity RA formulation