10 ml. Head relief essential oil roller helps clear up and ease the discomfort of headaches with lemon, clove and peppermint suspended in an organic coconut oil base. Apply to wrists, chest, temples, and/or back of neck as needed, until headache has subsided. Our roller bottle is glass with a plastic roller/applicator. Ingredients: Organic coconut oil, Pure essential oils (lemon, clove, peppermint).