※ Please do not comment before purchasing, such as "Can I buy this at ○○cm?" If you are buying a single item, please purchase it without commenting. We ask that you refrain from commenting as we may miss your comment, or you may not purchase the item after commenting. However, please be sure to inform us of the length after your purchase. This is a chain necklace made of surgical stainless steel. It's a classic ball chain. The ball necklace chain, which is a series of many beads, is a standard chain that can be matched with any pendant top, regardless of whether it's for men or women. The clasp of this chain is a cylindrical connector type, also known as a dog tag, so it is simple, durable, and hard to break, easy to thread through a pendant, and easy to adjust the length by cutting it with nippers, etc. It is very convenient to use. It is a medical-grade stainless steel that minimizes allergic reactions and is gentle on the body. This material is recommended for those who cannot use silver accessories due to metal allergies. Since it is a metal that is unlikely to discolor, it does not require maintenance such as polishing, and you can enjoy it very easily. ※ In rare cases, it may not suit your skin, so please stop using it immediately if this happens. This product allows you to choose the length up to 90cm. We accept orders in 1cm increments, so please let us know when you make your purchase. ※ However, please note that there may be slight errors. Please note that some people specify the width, but the width is only as stated and cannot be specified. Please understand this in advance. ■ Width and thickness of the chain: Approximately 3.0mm wide x 3.0mm thick ■ Material (including clasp): Medical-grade surgical stainless steel, which is resistant to metal allergies