Pilot pen box

This is a box a made for my set of pilot precise v5 pen, it has an opening for four pens, it uses the metallic part of the pen cap to mantain the pen cap inside the box when trying to take the pen off the cap.

Has 4 holes on top of each pen cap to press the metallic part and be able to take them out of the box.

If you have any improvements let me know so i can improve mine.