The Hero Arts Florals Poly Clear Stamps-You're Beautiful! 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% photopolymer which is latex free, phthalate free, non-toxic and biodegradable, and are also available in a variety of designs, each sold separately. This pack contains a set of 30 stamps.