Introducing The activator is a handheld device with 540 Titanium Alloy 1.5 mm micro needles. When used with topical tonics and oils on the scalp, it boosts blood circulation and boosts absorption scalp absorption, improving efficacy. All this for faster results! About A derma roller is a handheld device that is designed to help improve the appearance of the skin by using tiny needles to create micro-injuries on the surface of the skin. The device typically consists of a handle with a roller head that is covered in small, fine needles. Our Derma roller is available in 1.5 MM needle length, and is made from a variety of materials, including stainless steel and titanium. To boost circulation Activate inactive follicles 1.5 mm of needles open up follicles to boost blood circulation and promote follicle development. To improve hair health Strengthens current growth 1.5 mm of needles open up follicles to boost blood circulation and promote follicle development.