INSPIRE FRAGRANCE COLLECTION: A curated selection of our most indulgent fragrances- Spiced Citrus, Butter Fudge, Cinnamon Spice ABOUT CELLO ESSENTIAL OILS: Cello Essential Oils have been lovingly created to work in harmony with our Ultrasonic Diffusers, to give you a unique sensory offering. Each bottle contains 15ml of fragrant oil. Simply add water to the fill line on your Ultrasonic Diffuser and add 3-5 drops of essential oils, replace the lid and cover, turn on and enjoy.