Carry a 9mm pistol? What a PERFECT accessory!! Our 9mm Adjustable Bullet ring is made from a real, recycled 9mm bullet casing! Customize it just the way you like it by choosing your favorite Swarovski Crystal color (April shown)! It's also available with a nickel 9mm (shown) or a brass 9mm! The 9mm bullet is just over 3/8" in diameter.