Thank you for viewing. This is a Kihei chain necklace. The material is surgical stainless steel (316L), and it's all stainless steel. 316L, 304, and 202, known as surgical stainless steel, are low-allergen materials and are 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 and resistant to corrosion, oxidation, and heat. Unisex (for both men and women) Sizes: Total length 40cm, 45cm, 50cm Please specify your desired size after purchase. (If no size is specified, we will send 45cm. Please understand.) Chain width: 5mm Material: Surgical stainless steel, gold coating Color: Gold Please feel free to ask any questions.