Hero Arts-Kelly Purkey Stamp & Cut. These clear stamps peel off their backing and stick to any acrylic block making for easy stamping. Simply apply your favorite ink and stamp crisp clear images! They are made from 100% photo-polymer which is latex free, phthalate free, non-toxic and biodegradable. Use the dies for an added layer! This package contains Documented: a set of five clear stamps on one 3x4 inch backing sheet and two coordinating dies. Non-toxic and phthalate-free. Made in USA.