Aster Petal Background Cards (approx. 5 x 7 inches): 250-300 gsm heavyweight cover 100% recycled white cotton processed chlorine free Handmade cards are embedded with real blue pink and purple aster petals and grass they will vary in thickness and petal arrangement and color. Background cards are used for our unique layered invitations. A printed overlay embellishment and envelope is required to complete the look. Click to view complete list of blank invitation supplies.