Drop essential oil or fragrance helping to keep the room good smell. Especially good for small room. Size: 8.8 * 6.7 * 2.5(thickness) cm Size: 3 1/2" * 2 3/5" * 1" Please be kind to know, we are selling these essential oils or fragrances for the convenience to use on Aroma stone. If you need any professional assistance on how to use essential oils, please check with essential oil stores. ##Please be kind to know some of essential oils have natural color. It will effect the color of finished item. ## Each aroma stone wall hanging product is made by hand. Color might be slightly different each one. And, bubbles can't be prevented also.