Metal Leaf is a micro-thin sheet of composition metal separated by pages of tissue paper. All through history in the world of decorative arts, metal leafing has played a very prominent role. Precious metals continue to exemplify quality and good taste. Mona Lisa leaf products and techniques make the leafing process fun and foolproof with satisfying results every time. This Genuine Copper package contains 25 sheets. Sheet size 5 1/2"x 5 1/2". Leaf is composed of 100 % copper and will tarnish/patina with age if not sealed.