Paying homage to the beauty of the National Parks system with vintage WPA posters for Yellowstone, the Grand Canyon, Zion, and Yosemite this coaster set is the perfect touch of retro travel decor. Each coaster set comes in a decorative wrapper - perfect for that easy, affordable ready-to-go gift! With an MDF base and a cork back every coaster is sealed with a waterproof, heat resistant resin (similar to that used to coat restaurant bars or tables) that provides a glossy finish and guarantees a long life. Please Note: My coasters are made-to-order just for you.