They're easy to use: Simply peel a stamp off the backing sheet, place it on an acrylic holder, ink it up and stamp! Clean your stamp with a stamp cleaner or soap and water, then return it to the sheet, positioning it to match the printed image. (Please dont use baby wipes or acetone, bleach or any oil-based cleaner.) Our special acrylic wont yellow. Stamp sheet measures 5 1/2"x7".