This chain maille is made of galvanized, round, butted rings. Galvanizing the rings' surface provides protection from corrosion (rust). We call this type of chain maile Butted Mild Steel Zinc-plated.
A hauberk is a long-sleeved chain mail shirt that reaches to the knees.
Details - chest circumference: approx. 140 cm when fully extended. Your chest should not exceed 125 cm when wearing your gambeson. - length: approx. 114 cm - arm length: approx. 55 cm - ring thickness: 1.6 mm - interior diameter: 8 mm - weight: approx. 16.5 kg - finish: zinc-plated