Thank you for viewing. This is a Figaro chain necklace made of surgical stainless steel (304). Surgical stainless steel, such as 316L, 304, and 202, is a low-allergen material also used in medical tools like scalpels and scissors, as well as in high-end watches. It is a special type of stainless steel with excellent properties, such as being rust-resistant and highly resistant to corrosion, oxidation, and heat. Unisex (for both men and women) Sizes: Total length 38cm (choker type) Total length 43cm Total length 48cm Please specify your desired size after purchase. (If no size is specified, we will send the 43cm size. Please understand.) Chain width: 8mm Material: Surgical stainless steel (304) Color: Silver If you have a size preference other than the above, please inquire. Please feel free to ask any questions.