Heavyweight 140 lb. cards offer the attributes of a watercolor paper but with a vellum drawing finish. They are ideal for watercolor, gouache, acrylic, graphite, pen & ink, colored pencil, marker, and collage. Envelopes are included. Acid-free. 10-pack. Slim size cards measure 3 x 7/8" x 9". These cards are sized to fit into a #10 envelope and are perfect for greetings and correspondence. Slim size matching envelopes are 9 1/2" x 4 1/8".