This is a keyholder with a small blue metal case. A vinyl tube has been placed over the ball chain connection to prevent it from easily coming off. It doesn't hold very large items, but I personally love the flashy and vibrant case. It has a large lobster clasp, so it can be easily attached to a bag, etc. Case size Outer diameter: Height: approx. 5.8cm, Thickness: approx. 1.7cm Inner diameter: Depth: approx. 3cm, Diameter: approx. 1.2cm Material: Metal Please take a look at my other items as well. *Although I make them carefully, the finish is not like a mass-produced product. Please understand this before purchasing.