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 and non-toxic. Available in a variety of designs (each sold separately). This package contains World's Greatest: a set of 13 stamps on a 4x3 inch backing sheet. WARNING: Choking Hazard. Not suitable for children under 3 years. Made in USA.