Rope chain, width approximately 2mm Length: 45cm Surgical stainless steel 316L Surgical stainless steel 316L, also used in medical supplies. It does not discolor, is resistant to scratches and dirt, and is a safe material that is unlikely to cause allergies. It creates a semi-permanent shine! The safe gold color with K18 plating is achieved by applying K18 plating to the surface of the stainless steel. Because of the high purity of gold, it is said to be less likely to cause allergies. It is resistant to rust and discoloration, and the shine lasts a long time.