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 are proudly made in the USA and measure 4" x 4". Cleaning: Hand-wash recommended. Simply wipe with a damp soft sponge or cloth. Do not use any abrasive cleaners or pads.