This horseshoe body jewelry is crafted with 316L Surgical Steel then IP plated with Titanium for a smooth, matte black finish. IP (Ion Plating) is a safe and permanent fusion coating process used to enhance the durability of jewelry. This horseshoe is 14 gauge and 12 mm in diameter with 5 mm balls. As always, please feel free to contact us with any other questions you have about this item by following this link: https://www.amazon.com/gp/help/contact/contact.html?ie=UTF8&asin=&isCBA=&marketplaceID=ATVPDKIKX0DER&orderID=&ref_=aag_d_sh&sellerID=A1R6RX168R6Z0F&