National Geographic Blank Inside Note Cards w/ Envelopes "Wonders of the Ocean" 12 Cards, 13 Envelopes & a National Geographic Keepsake Box Included! Thank You Cards, Stationery Cards &ndash; 3.5&rdquo; x 5&rdquo; National Geographic notecards - Your purchase helps support National Geographics nonprofit mission. 12 Cards, 13 Envelopes and a one of a kind National Geographic keepsake box with magnetic closing lid 6 Designs - 2 cards of each design Blank inside 5" x 3.5" Card Size