Xplorer Maps ceramic coasters are highly absorbent, vibrantly colorful, and have a cork backing to prevent slipping and scratching. Featuring original Xplorer Maps art in fine, full-color detail, the coaster art is pulled from the original hand-drawn map by Chris Robitaille. Ceramic coasters measure 4" x 4". Sold in sets of 4. Cleaning: Hand-wash recommended. Simply wipe with a damp soft sponge or cloth. Do not use any abrasive cleaners or pads. Xplorer Maps creates the finest hand-drawn and hand-lettered illustrations of national parks, historical sites, and favorite travel destinations around the globe. Every line, letter, and icon is unique, custom, and original to each new map we render. In an antique, old-world style, these high-quality custom maps were created by artist/co-founder Chris Robitaille in honor of the earliest cartographers. Our Maps have a couple of differences from other map companies on the market. First, everything we do is custom and original art; no public domain art or computer-generated graphics. Everything we create is hand-drawn using pen and ink and watercolors. Secondly, National Park Service interpretive specialists verify that all of our fine-art illustrations are educationally and interpretively valuable, culturally relevant, and historically and geographically accurate.