The solder wire is 1.5mm, (1/16″),  diameter, it is self fluxed so you don’t need to buy a separate flux and the coil is 2.5 meters long.

The composition of the solder is Tin, Silver and Copper, there is no lead so it is food safe.

If you are soldering sheet metals like zinc, brass or copper with a soldering iron you would need to clean the joint so there is no contamination or oxides present and you may need to preheat the metal and use an iron of around 200 watts to make it easier.