Book rings are the sure fast method of keeping things together. These binding rings are made with a smooth and tough steel coating that ensures that your binder rings won't crack or chip. Durable metal book rings can be used for a huge assortment of projects as well as conveniences around the home and classroom. That's right, book rings are not just good supplies for the office anymore. Package of 36 rings; assorted metallic colors (red, green, blue, yellow and purple) and sizes.