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. This package contains Peek-A-Boo Pals, Spooktacular: a set of 22 stamps on a 3.875x3 inch backing sheet. WARNING: Choking Hazard. Not suitable for children under 3 years. Made in USA.