German made *Aurigan bit in good used condition. 5" bit , 70 mm rings $50 Aurigan is an incredible metal patented for use in Sprenger bits. Aurigan is an ideal material for use in bits due to being makeup being 85% Copper, 11% Zinc, and 4% Silicon. The Copper provides a sweet taste for horses and the high oxidation of Aurigan as a whole encourages your horse to chew and accept the bit more readily. The acceptance of the bit creates a more natural and genuine contact improving the quality of performance.