These are double rings for holding keys, keychains, etc. The material is brass. This listing is for a set of 3. They can be used to bundle keys and keychains, or for connecting wallet chains and keychains. Please use them as custom parts as you like. Brass Diameter: 32mm Inner diameter: 25mm *There may be some blackening from the manufacturing process. Please be aware of this. *You can purchase without prior message. [Discounts] Discounts are not available for single item purchases, but for multiple purchases, the second item and onwards will be discounted by 200 yen. Example: 2 items total will be discounted by 200 yen, 3 items total will be discounted by 400 yen. If you wish to purchase multiple items, please comment on each sales page. We will create a dedicated page and contact you later.