1 m banner. According to official website, the length of banners has something to do with arches. The arch is 2m high and1.8m wide. The arch covers an area of 6-20 meters. Then the number of words on the banner will be adjusted accordingly to ensure the beautiful atmosphere of the arched banner. The banner of 1 m is just right for the 4 m arch, so the banner of 1 m is used for the 4 m arch.