Volcanic andosite quartz crystals emit negative ions and when added to resin, produces brush quills that have a safe natural energy when used in brushing. This has been proven to have restorative benefits on hair. Capillary vessels become stimulated and the cuticle layer is tightened which seals in natural oils, helping to promote hair growth and leaves hair soft, smooth and vitalized. Suitable for use on shoulder or longer hair, and to create bobs.