ciite' surgical stainless Size: US 6.5 (Japan 13) Yellow Gold Only tried on, unused 【 Hypoallergenic Surgical Stainless Steel 】 ① The highest-grade hypoallergenic material, also used in medical scalpels. ② Extremely resistant to discoloration and rust. ③ Water-resistant, so you can wear it in the bath, hot springs, sea, and pool without worry. This material is very popular with those who have metal allergies, as well as those who don't, because it's "safe to wear all the time! Gentle on the skin!"