.6mm (.024in.) Solder. 60/40 Rosin Core ~0.5lb Spool – #SolderHalfLb

This solder is known as 60 / 40, meaning that it is 60% tin and 40% lead. The size of this (0.04 inch diameter) is designed for ease of use.

This combination of alloy ratio and rosin core and diameter is a favorite of Litchfield Station, LLC.