The thickness of the paper is generally described by the word "gram weight" (meaning how many grams of weight (per square meter of paper)). The thickness of the paper is generally limited according to the market demand and the production process. The common weight of the coated paper is: 80, 90, 105, 128, 157, 200, 250, 300, 350, etc.; Common weights are: 70 (the weight of the paper that feels thinner), 80 (the weight of the paper that feels thicker), 100, 120, 140, 180, and so on. There are some differences in the choices of different brands, but the mainstream is basically these.
In addition to the above two categories, you may have seen a lot of "paper" with different colors, different patterns and different printing effects, which involves another large piece of paper, which we collectively call: special paper. Special paper can be different in many dimensions such as color, thickness, texture, printing effect, gloss and stiffness.