The back of this product is made of metal, and the front part is made of ABS. There is a metal clip on the back that can be fixed to your shirt, belt, or bag. The length of the retractable rope is 23 5/8 inches and it is made of steel. It makes it convenient for you to use your keys and ID card. It is suitable for companies, concerts, buses, daily commuting, schools, etc. You can use it anywhere you need to indicate your identity.