EFYTAL Initial Necklace, Large Sterling Silver Letter with Birth Month Charm, 15.9 mm Personalized Disc TO CUSTOMIZE: click on the yellow 'Customize Now' button on the right DIMENSIONS: Chain: 16" (40.6 cm) or 18" (45.6 cm) | Pendant Diameter - 5/8'' (15.9 mm) this pendant is pretty big MATERIALS: Sterling Silver chain and pendant, choose your own Birth Month Charm. The chain is dainty but strong, and will not break. Efy Tal Jewelry (manufacturer) will always replace it for you if needed. GUARANTEE: Love this EFYTAL necklace or your money back! 5 year warranty on chain.