10–35 gsm tissue paper
35–70 gsm lighter textweight
70–100 gsm medium textweight
100–120 gsm heavy textweight/light cardstock
120-150 gsm regular cardstock
150-200 gsm heavy cardstock
>200 gsm super heavy cardstock
Source: https://answers.yahoo.com/question/index?qid=20080715103223AARVYHb