This is a cover-separated type that allows you to change the binding thickness depending on the amount of paper to be stored. For bursting: This type separates continuous paper forms one by one and binds them by the marginal punch holes. Cover: Colored cardboard (green) 1 set: 600 yen (current listing price) 2 sets: 1200 yen #EF151EG 3 sets: 1800 yen #EF151EG 4 sets: 2350 yen #EF151EG 5 sets: 2900 yen #EF151EG For 6 or more sets, please comment before purchasing to change the number of sets. #aai Electric Company