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Tips :
About paper weight refers to the weight of paper per square meter
Thickness and weight are proportional, the higher the weight, the thicker the thickness
For example, 70 grams is 70 grams per square meter. (That is, the thickness of ordinary printing paper)
200g-230g is equivalent to the thickness of a normal business card (the thickness of 3 sheets of copy paper, the hardness should be quite a bit)
300 is equivalent to the thickness of 4 sheets of 70 grams of copy paper, and 400 grams is equivalent to the thickness of 5-6 sheets of copy paper