Book rings are made with 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. A rust free metal book ring from Hygloss is meant to last through heavy duty usage and can stand up to wear and tear. The rings range in sizes from one inch, one and a quarter inch, one and a half inch and two inches. Each pack contains 36 book rings per pack with 9 each of 4 assorted sizes.