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 Happy: a set of eighteen clear stamps on one 4x3 inch backing sheet and one coordinating dies. Non-toxic and phthalate-free. Made in USA.