Bundle and save! The Oil Roller Duo comes with our two signature blends, Boost and Calm. Whether you're looking for some energy or a moment of peace, this set has you covered. The roller applicator ball is made of green aventurine crystal, a stone known for its healing properties. Take a deep breath and apply to the back of the neck, forearms, and reflex areas on hands and feet. Made with 100% Pure Essential Oils.