Lifelines Pen Diffuser with Essential Oil Blend- Crisp Mountain Air. Keep your ideas flowing with a pen that diffuses delightfully invigorating scents as you write. Pen contains four Essential Oil Bends from our Crisp Mountain Air collection, featuring wild mint, peppermint, and rosemary. Simply lower the desired tab to select a single scent—or diffuse multiple blends at once to create a custom fusion!