Raku bottles are small ceramic flasks glazed only on the outside. Raku refers to the clay and firing process used to make this wonderful little vessel. You may use it to hold sand, earth, herbs, salts, or oils. As the inside is not sealed, the clay will act like a sponge to an oil and the vessel will become a diffuser that you may wear as a pendent or display in the car or home. They are sealed with a cork, and come with a satin cord for hanging. 1 1/2” diameter. There is also a wonderful iridescence to the colors and as each is handmade they are all unique and special and have some color variations.