The State Puzzle Coaster Set with Case offers a natural solution for protecting tabletop. These sturdy coasters are crafted from organically-grown Moso bamboo, an environmentally-friendly material solution that quickly re-grows once harvested. Bamboo is both lightweight & durable a perfect choice for coasters! The coaster set includes a handsome case to store coasters neatly when not in use. The coasters are easy to care for as well: simply wipe them w/a damp cloth to clean.