Skull & Face Signet Ring (Surgical Stainless Steel) A stylish ring with a strong presence! ★ See the image for specifications. ★ Made of stainless steel 316L, which does not discolor in pools, seawater, or hot springs. Ring Head Size: Approximately 23.6mm (height) x 20mm (width) Ring Size: US 7 (JP 14) Sold Out US 8 (JP 16) Sold Out US 9 (JP 18) Sold Out US 10 (JP 20) Sold Out US 11 (JP 23) US 12 (JP 25) US 13 (JP 27) Sold Out *Please message us your preferred size. ★ About Stainless Steel 316L Stainless steel is generally known as a strong and rust-resistant metal, but there are actually many types depending on the usage environment. Among the austenitic stainless steels with improved corrosion resistance, stainless steel 316L is particularly excellent in corrosion resistance. The "L" in 316L stands for "Low Carbon," indicating a low carbon content, which reduces corrosion resistance. It is also a special type of stainless steel with a relatively small distribution volume. Due to its high corrosion resistance, it is used in medical instruments and is sometimes called surgical stainless steel. Regarding metal allergies associated with metal ionization, the high corrosion resistance = low ionization properties make it suitable for jewelry as a metal that addresses metal allergies. Stainless steel 316 is used for marine sports and is seawater-resistant, while stainless steel 316L has even higher corrosion resistance.