The Perfect Advent Calendar Kit Order before Thanksgiving so you'll be ready to start your countdown on Dec 1 25 days of fun family activities to give the gift of time to your loved ones Cards are printed on heavy paper to insert into decorative envelopes numbered 1-25 Attach envelopes to enclosed string to complete one day at a time for a Christmas to remember Each envelope measure 3 inches x 5 inches and comes with over 11 feet of red ribbon