WHIMSICAL & HUMOROUS SCIENCE POSTCARDS to send to friends, family, or coworkers. 25 UNIQUE & COLORFUL DESIGNS in the collection, perfect to send a little laughter to others! Size allows for USPS Postcard Rate Stamps. SIZE: 5.47" x 4.21" Standard Postcard size, Heavy 14 pt./ 80lb one-sided Matte Card Stock with UV Varnish FRONT: Matte Finish [soft and vibrant] BACK: Standard Finish [great for readability & easy to write on] DESIGNED, PRINTED, AND ASSEMBLED in the USA. Are you the kind of person who is super nerdy and living your best life? Then this postcard collection for you or for the delightfully sciency people in your life! The Nerdy Life STEAM NaCl Edition NEW 25-Card Expansion Pack Postcard Collection includes 5 BRAND NEW DESIGNS! Nerdy Life STEAM focuses on Science, Technology, Engineering, Arts, and Math (with a twist!) Available in standard size (5.47" x 4.21") on 80lb one-sided Glossy Card Stock with UV Varnish. Will also include a clear resealable BOPP Cellophane non-porous bag. Available with the following options: 15-Postards -Answer -Atom -Avocado's Number -Books -Can't Even -Energy -Fibonacci Sequins -Mitochondria -Mole-COOL -Puns -SArCaSm -String Theory -Velociraptor -Word Nerd -You Matter .. 20-Postcards includes the 15 above plus -Data -Pi -Problems -Real -Slope .. 25-Postcards includes the 25 above plus -Awkward -Data Driven -Fa=F0 -Space -Talk Nerdy