Avery Elle-Clear Stamps. These clear stamps 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. This package contains Butterflies: a set of sixteen clear stamps on a 6x4 inch backing sheet. Available in a variety of designs (each sold separately).Made in USA.