This aroma pebble is made of roof tile clay that is from Okinawa. The roof tile is used in Okinawa where it rains a lot. Okinawa clay is known for well absorbent and quick dry. The Okianwa crafter made the aroma pebble. It has the same feature. Pick your favorite scent from your selection and enjoy! You can put right next to your bed, leave it in the kitchen or bathroom.