A4 paper only represents the paper size (297mx210mm), with thicknesses of 70g, 80g, 1 10g, 200g, etc. The greater the grams, the thicker the paper. There are 70g and 80g commonly used laser printing/copying papers.

The paper thickness standard of 70A4 paper commonly used in China is 0.088 mm. ..

A4 paper size is 2 1× 29.7cm,

The side sheet of 255 sheets of paper is about 2.2 cm if it is 70 grams of paper, and about 2.8 cm if it is 120 grams of high-gloss paper, so:

The paper size is:

Length: 29.7+29.7+2.2=6 1.6 cm (70 g)

29.7+29.7+2.8=62.2 cm (120g)

Width: 2 1cm.