Handmade Sage Green 5×7 Cardstock for Invitations 5×7 Cardstock for Invitations (approx. 5 x 7 inches): 250-300 gsm heavyweight cover 100% recycled cotton processed chlorine free. Handmade cards are embedded with silky fibers they will vary in thickness and color. Background cards are used for our unique layered invitations. A printed white or vellum overlay embellishment and envelope is required to complete the look. Click to view complete list of blank invitation supplies.