Hero Arts-Kelly Purkey Clear Stamps. 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. Available in a variety of designs (each sold separately). This package contains Take Note: a set of nine clear stamps on one 4x3 inch backing sheet.