Size: Approximately 4 cm in diameter Aroma stones Set of 6. ◽️Please use by dropping your favorite aroma oil. If the scent fades, add more oil. ◽️We use peppermint oil as a pest control measure and place them indoors. It's highly effective. ◽️Important Notes: These are made of gypsum. We are not responsible for any accidents during shipping. Handle with care as they will break if dropped. These are handmade, so there may be small air bubbles, chips, or uneven surfaces. While we make each one carefully, they are not the same as mass-produced items. Please understand this before purchasing. Type: Aroma stone