Approximate charm dimensions: .87"W x .75"H. (millimeter measurements 22mm x 19mm). Necklace chain dimensions: 2.5 mm wide x 18 inches long with a 1-inch extension. The single-sided Cardinal charm is made from silver-finished pewter (zinc-based pewter alloy), and rich hand enameling in colors of red / black / green / silver / grey. With the look of real silver, the 18" + 1" ext. silver plated brass cable chain is very beautiful and durable and secures with a lobster clasp. Additional Details ------------------------------ Product description: Approximate charm dimensions: .87"W x .75"H. (millimeter measurements 22mm x 19mm). Necklace chain dimensions: 2.5 mm wide x 18 inches long with a 1-inch extension. The single-sided Cardinal charm is made from silver-finished pewter (zinc-based pewter alloy), and rich hand enameling in colors of red / black / green / silver / grey. With the look of real silver, the 18" + 1" ext. silver plated brass cable chain is very beautiful and durable and secures with a lobster clasp.