Ecosaurus note cards are printed with vegetable-based inks on Neenah Environment PC100. They are 100% post-consumer waste, processed chlorine-free, FSC Certified and Green-e Certified. The envelopes are made of this same paper. Card sizes are A-2 (4.25 x 5.5 inches folded). Boxed sets include 9 cards (three of each design) and 9 white envelopes. Products ship within 1 - 3 business days.