They are crafted from hardwearing bamboo, a natural material that is easy to care for.The bowls are available in various sizes and materials, including wood, metal, and glass, and are designed to be stackable for space-saving storage.These bowls are recommended for serving rather than mixing, as the lacquer can scratch and water may cause discoloration over time.They are not suitable for microwave use and must be washed by hand rather than in a dishwasher.