Material: pen, paper. Choose cardboard, measure the edges first and then cut them, mainly using plastic trimming, making them step by step and combining and pasting them.

Select A4 cardboard, mark it, draw lines and cut it, then fold it along the line and paste it in turn.

Select cardboard, mark and draw lines first, cut along the line, insert the combination, and finally decorate. With cardboard, draw a line first Then fold along the line.