Our dense hair roller contains rosemary oil, glycerin, coconut oil.It cleanses the scalp, controls oil secretion and prevents excessive oil secretion from clogging hair follicles.It helps hair growth nourishes hair roots, improves hair health and repairs damaged hair.It is easy to use: first clean your hair or beard, blow dry and squeeze out the right amount of serum and apply it to the affected area with a roller ball.Massage the scalp with the ball for 2-3 minutes until the product is absorbed (no need to rinse), and use once a day in the morning and evening for best results.Stimulates hair follicles, strengthens hair roots, promotes hair growth and smoothes hair for thicker, darker hair.