Two sizes of blue Gachak. This stationery item is used to bind multiple sheets of paper without punching holes, and it uses special small metal clips called "Gacha-dama." Unlike a stapler, it doesn't make holes in the paper, and the clips can be removed and reused, making it extremely user-friendly. The large size can bind paper up to 4mm thick, and the small size can bind paper up to 2mm thick. A box of 2 types of spare clips is also included.