HERO ARTS-Clear Cling Stamps. These clear stamps peel off their backing and stick to acrylic blocks; making for easy stamping. Made from genuine photo polymer for crisp and clear images. Simply place the cling image onto an acrylic block; apply your favorite ink; and stamp! Made from 100% photo-polymer; non-toxic; latex and phthalate- free. This package contains Sending Holiday Cheer: one 6x4 inch sheet of stamps. Made in USA.