Amy Tan Finders Keepers Acrylic Stamps: Icons And Phrases. A fun and easy addition to all your paper crafts and more! Simply peal from the backing sheet place on a clear block stamp and decorate away! This package contains eight acrylic stamps on one 4x4 inch backing sheet. Acid free. Archival Quality. WARNING: This product contains chemicals known to the State of California to cause cancer birth defects or other reproductive harm. Do not mouth or chew. Imported.