Nipple Shield. 316L Surgical Steel Bar with Circular Nipple Shield. 1.6mm gauge. Available in 10mm - 16mm bar length. This nipple shield is suitable for use in a healed Nipple Piercing. For help with sizing please read our guide. Made from highly polished 316L Surgical Steel. Supplied with two screw-fit steel balls, other screw fit add-on's such as gem balls and cones can be purchased separately to be used with this nipple shield.