Thank you for viewing! This is a surgical stainless steel (304) padlock (padlock) menter necklace. Surgical stainless steel, such as 316L, 304, and 202, is a low-allergen 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. Sizes: Total length including fittings 38cm (choker type) Total length including fittings 43cm Total length including fittings 48cm Please specify your desired size after purchase. If no size is specified, we will send the 38cm size. Thank you for your understanding. Chain: 4mm x 12mm Padlock: 23mm x 15mm Material: Surgical stainless steel, gold coating Color: Gold Please feel free to ask any questions.