The 80 gram per square meter means how much 1 square meter of this particular paper weighs. 16 sheets of A4 paper are actually 1 square meter. This fact can be used to assess the paper thickness of a given pack of paper. Most of the Polish models use 160 g/sq meter paper and usually this paper is 0.22 mm thick Your regular office paper is usually 80 grams per square meter, sometimes 70 and sometimes 90. Need to notice that the different paper of certain weight per square meter not always will be the same thickness. For example, depending on paper's density, 160 grams per square meter paper's thickness can vary from 0.2 to 0.24. Although 0.01 mm is almost not noticeable, sometimes this difference can cause a lot of headache in parts fitting I from the other hand, don't really understand what 110 lbs card stock measurement means.