Both 14 pt. and 16 pt. cardstock are made of the same material. The only difference is the thickness. 14 pt cardstock is .014” thick and 16 pt cardstock is .016” thick. 16 pt cardstock is thicker and as a result, more stiff than 14 pt cardstock. Both 14 pt and 16 pt cardstock are more stiff than 100 lb paper stock.