Our hair care roller set contains rosemary leaf extract, vitamin E (tocopherol). It can help the growth of healthy hair, making it thicker and thicker. The way to use it is very simple: before using, please make sure that your scalp is clean, take an appropriate amount of serum, and evenly apply to the scalp. Gently roll the roller over the scalp, especially in areas that need increased hair volume, to help with serum absorption. It also provides nutrients that help strengthen hair and reduce fragility and breakage.