Double joint BRISTOL bit made of nickel silver. Rings of 70 mm. Full mouthpieces of 16 mm. For horses with a narrow palate. The nickel silver (fr: maillechort), German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum is a copper alloy with nickel and often zinc. This allow has been created by the French Maillet and Chorier in 1819 and give it their names.