Unlike "ultra-light" fabrics (under 100 GSM) which may be prone to tearing, 116 GSM offers enough fiber density to withstand repeated industrial washing. 2. The 116 GSM Standard in Premium Paper
Interestingly, the term "116M GSM Data" also appears in modern datasets.
While standard letterheads are 90–100 GSM, upgrading to 116 or 120 GSM significantly improves the tactile experience for the recipient. It feels "substantial" without being as rigid as cardstock.