Body: solid satin brass with transparent varnish protection and rounded edges to avoid abrasions. Shackle: case-hardened and tempered steel for high resistance to attack, copper, nickel and chrome-plated for high corrosion resistance. Keys: supplied with 2 Viro profile nickel plated brass keys. Versions available with patented profile keys (form trademark) which can only be duplicated by Viro (.PB profile) or versions which can be duplicated only by Viro authorized centres