Create original artwork on fine 5'' x 7'', pre-scored Watercolor Cards. Made of 140 lb. cold-press watercolor paper, they're ideal for wet media such as markers, acrylic, gouache and watercolor. Cards come with complementing envelopes. Full Size Watercolor Cards These larger size cards can be used to design a greeting for any occasion from birthdays, holidays and invitations to general correspondence. Full Size matching envelopes are 5.25'' x 7.25''. Package includes 10 cards and 10 envelopes.