These high quality cards are made from 140lb. cold press watercolor paper. This heavyweight paper has excellent surface strength and resists buckling. Perfect for anniversaries, baby showers, birthdays, bridal showers, announcements and more. Ideal for watercolor, acrylic, or gouache. Included envelopes are 70lb/104g. This package contains six (6) 5x6.875 inch 140lb watercolor cards and six (6) 5x7 inch envelopes. Acid free.