My Colors Cardstock is manufactured with a high degree of care and consistency. Sheets are core-dyed and monitored to ensure a uniform color match from each dye lot. It's made from high quality virgin pulp, which results in paper with long fibers that's easier to score and fold without cracking or ripping effects. It's also great for nice, clean, even cuts when used with a die cutting machine. The Heavyweight line of colors are 100lb cover weight or 270 GSM and feature a smooth finish. Included is one 12x12 sheet of cardstock. Acid & lignin free.