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 With Sympathy: a set of fifteen clear stamps on a 3x4 inch backing sheet. Available in a variety of designs (each sold separately).Made in USA.