American Crafts-Minc Postcard Kit: Amy Tan Finders Keepers. The perfect start to creating your cards with a pop of color! Use with the Minc foil applicator and foil to give them a unique shine (sold separately). This package contains six 4x6 inch postcards with a different design on each. 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. Acid free. Archival quality. Imported.