Thank you for viewing. This is a leather surgical stainless steel (316L) bracelet. The clasp is a push-in type with a magnet. It's stress-free to put on and take off. Surgical stainless steel (316L) is a material with extremely low allergenicity and is also used in medical tools such as scalpels and scissors. 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) Sizes: 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 17cm size is suitable.) Please specify your size after purchase. (If no size is specified, we will send the M size. Thank you for your understanding.) Leather width: 10mm Leather thickness: 5mm Materials: Leather (genuine leather) Surgical stainless steel (316L) Color: Leather - Natural Clasp - Matte Silver Please feel free to ask any questions.