Periwinkle Star Ceramic Diffuser, H= 4.5": This glazed ceramic diffuser has a one piece design with the bowl attached. Made by our valued supply partners in India. To use our diffusers fill the diffuser bowl with water and approximately 10 drops of Triloka essential oil. Place a tea light in the bottom of the diffuser, light, and enjoy! For oil blending recipes and usage information see our Triloka Essential Oil brochure.