Weller Electronic Lead-Free Solder is ideal for soldering semi-professional soldering tasks. S-Sn99Cu1, DIN EN 29453 (Sn99, 3Cu0.7). 2.2% flux according to DIN EN 29454, 1.1.2.B, EN 6190-ROM1. Specification & Oslash1.0mm on a spool with 100g