The ribbon used is another one of the ribbons you can get for free this month with each $40 in orders.
My Supplies List (all supplies and images by Stampin' Up! unless otherwise noted):
Stamp Set(s): Postage Due
Ink: Midnight Muse, Marina Mist, So Saffron
Papers: Midnight Muse, Marina Mist,
Accessories: Postage Stamp punch, Midnight Muse stitched satin ribbon