This pipe-style binder is convenient for documents that require frequent insertion and removal. It's the most popular type. *This product was purchased several years ago, so the model number may be outdated. Unused, long-term storage item. For those who want to buy it a little cheaper! For those who just need it to work! Great deal! This product is for 3 individual binders. *I am also selling a set of 10, so please take a look.