HERO ARTS-Basic Grey RSVP Cling Stamps. These 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. Available in a variety of designs (each sold separately). This package contains Bursts Background: one cling stamp in a 7-1/4x5- 1/2 inch package. Made in USA.