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 Greatest Gift: one 6x4 inch sheet of stamps. Made in USA.