Sagittarius - zodiac sign - magnet. Wed 6cm; enameled metal A great birthday present! Made using the enamel sign technique, exactly the same as the signs with the names of streets or offices. The technique is extremely resistant to weather conditions. Enamelling is one of the oldest and most durable techniques of artistic craftsmanship, known already in the first millennium BC. The main element of enamel is powdered glass, melted at high temperature, colored with metal oxides and applied to a metal substrate. A glassy, durable and colored coating is created and can be sanded and polished.