Cards come with complementing envelopes. Full Size matching envelopes are 5.25" x 7.25". Package includes 50 cards and 50 envelopes. Create original artwork on fine 5" x 7", pre-scored Watercolor Cards. Made of 140 lb. cold-press watercolor paper, theyÃƒâ€ re ideal for wet media such as markers, acrylic, gouache and watercolor.