ready to use in any diffuser. please do not apply directly to skin as irritation will occur. these are pure steam distilled plant based oils. if using with our car diffuser just add a few drops to the terracotta insert and snap into the case. these can also be used on wool dryer balls. just add 2-4 drops per load directly to the dryer ball and toss in the dryer. for cleaning: add 1 part vinegar to 4 parts filtered water and 2-4 drops of oils to a sprayer bottle and use when cleaning and wiping down surfaces. size * each vial is 15ml scent profile * balsam pine: cypress, fir needle, birchwood and a hint of cedarwood * chai nutmeg: cinnamon, nutmeg & clove essential oils * cranberry: a soft blend of pomegranate, cranberry with a hint of madagascar vanilla bean * pomegranate: cranberry and pomegranates blended with lavender & a hint of bay * cardamom: basil, cardamom & bay leaf * palmarosa: white peonies and warm vanilla