QMX Engineered by Firefly Belt Buckle Metal Alloy Our molded pewter-finish belt buckle features an exact replica of the builder plaque seen on the bridge of Serenity in the TV show, Firefly Measuring 4 inches across and 2.5 inches high, the Engineered by Firefly Belt Buckle is made of a strong, lightweight metal alloy This buckle fits belts up to 1.75 inches (4.45 cm) wide