Rollerball Castor Oil: Castor Oil Eye Roller. Our Under Eye Serum Has A Moisturizing But Refreshing Texture. Convenient and Simple to Use: The eye roller applicator can evenly distributes the eye serum around the eye area and provides a comprehensive massage of the eye contour. Diminishes Dark Circles: The Recommended Usage Frequency Is Twice A Day, Once In The Morning And Once In The Evening. Optimal Absorption: To achieve optimal absorption of nutrients, it is important to apply an appropriate amount of essence each time and use the unique cooling massage head and proper techniques to fit the skin around the eyes. This will help tighten the skin and provide long-lasting hydration without causing dryness. Instructions For Use: Suitable for all skin types, the recommended frequency of use is twice a day, once in the morning and once in the evening. Refrigerate for a better experience.