K Initial Necklace Only tried it on once. It's relatively clean, but it's a used item, so please understand. I am quoting from where I purchased it. ↓↓↓ 【Material】 316L surgical stainless steel 18K gold plating 【Size】 40-45cm (with adjuster) Initial part approx. 《About 316L Surgical Stainless Steel》 This material is also used in medical instruments, so it is recommended for those with metal allergies. (Not everyone will be free from allergies.) It is resistant to sweat and water and does not rust, so you can wear it in the sea, hot springs, and the bath. It is also very scratch-resistant and maintains its shine for a long time. 《Care Instructions》 Please gently clean it frequently with a soft cotton cloth. ●Due to the manufacturing process, there may be welding marks, jig marks, and fine scratches, but this is not a defect, so please understand. Jig marks: Jig marks, also known as rack marks, are made when the item is fixed to a jig during plating. The part that comes into contact with the jig may not be plated, and may look like a scratch or appear slightly black. These marks are called jig marks. The location of the jig marks varies depending on the product. These jig marks are not plating defects, but they cannot be avoided in the manufacturing process. Please understand. ※Colors, sizes, and designs may vary slightly depending on the production period. Please understand. ※Please be sure to read "Please read before purchasing." By the time of purchase, you are deemed to have agreed to everything, so thank you for your understanding.