What is the material of the couplets at the school gate?

Usually paper.

Usually you will see some inspirational couplets at the school gate. Students with good handwriting can also take turns to write and show.

Couplets, also known as antithesis, door-to-door, spring stickers, Spring Festival couplets, couplets and so on. It is a antithesis written on paper, cloth or carved on bamboo, wood and columns.