Solder tube, 60/40 Pb/Sn
Rosin core 60-40 lead/tin solder. Great for 30W to 50W solder pens.
We carry lead/tin solder because it is a lower temperature solder, resulting in fewer cold-solder joints, risk of burns, or oozing. It is a better solder for teaching people to solder or do quick jobs, and less prone to failure from temperature variations.
Lead is a toxic compound, so always wash you hands after using solder, do not hold in your mouth, and do not ingest.