Send a special delivery to a loved one with a card created using the Happy Mail Clear Acrylic Stamp Set by Hero Arts. This set of 17 clear stamps is made in the USA of genuine photopolymer. The stamps come on a 4" x 6" storage sheet. Use the clear stamps with any acrylic block (sold separately). The included stamps range in size from .65" x .45" to 5.75" x .25".