Totally Bamboo. Our State Puzzle Coaster series is a fun new take the coaster category. We've split Destination series inspired state artwork across four bamboo coasters. When the coasters are pushed together the complete the "puzzle" and show the full artwork of the state. Each coaster set includes a bamboo case for neat storage and a small in-store footprint. Great to be sold either for entertaining at home or as a gift!Coasters measure 4" x 4".