Thank you for viewing. This is a Kihei bracelet made of surgical stainless steel (304). The clasp is a fold-over type. Surgical stainless steel, such as 316L, 304, and 202, is a low-allergy material and is used in medical tools such as scalpels and scissors, as well as luxury watches. It is a special stainless steel with excellent properties, such as being rust-resistant, corrosion-resistant, oxidation-resistant, and heat-resistant. Unisex (for both men and women) Size: Wrist circumference (inner diameter) S size: 15cm M size: 17cm L size: 19cm LL size: 21cm (Example: If your wrist circumference is between 16.5cm and 17.5cm, the M size (17cm) would be the appropriate size.) Please specify your size after purchase. If no size is specified, we will send the M size. Please understand. The above sizes are not the total length. Chain width: 10mm Material: Surgical stainless steel, gold coating Please feel free to ask any questions.