I'm selling these at a low price because I purchased a large quantity. I am confident in the quality. Brand new, unused item. Total length: Approximately 50cm Chain width: Approximately 1.1mm Weight: Approximately 0.9g Plate width: 3.1mm K18 Yellow Gold K18 stamp present This is genuine 18-karat gold, not plated. I purchased these from a chain shop in Okachimachi. These are made in a domestic factory, a product of Japan. The screw chain, as the name suggests, has a spiral design. It's like a spiral staircase in appearance. It's a delicate size suitable for women, but men can also stylishly wear this 18-karat gold necklace subtly. The opening of the round clasp, which is the most likely part to break, is also welded for peace of mind. I also have 40cm and 45cm lengths available. Accessories Rings k10 18K pt Diamond 18-karat gold ring 18-karat gold necklace 18-karat gold pendant 18-karat gold bracelet