Kester 44 Rosin Core Solder 63/37 .020" 3/4oz Dispense-Pak Specially packed from Genuine Kester 24-6337-0010 solder 3/4-Ounce pocket size pack contains approx 48 feet of solder! 67/37 Tin/Lead is most common for electronics work .020" Diameter is most common for fine-pitch electronics work High activity RA formulation