The Weller T0051403199 WSW SnPb L1 Solder Wire 0.8mm 100g is designed to enhance the quality of all your soldering jobs, the T0051403199's WSW line of solder increases productivity, and optimizes your soldering performance. The T0051403199 reduced splash feature increases safety and enables you to have a cleaner work area. With a guaranteed 100% continuous flux core, combined with pure first metal melting, the T0051403199 enables long-term, highly durable solder joints without cracking, even on difficult surfaces.