This device typically has a small roller with many tiny needles attached to it, which are rolled over the skin to create the punctures. The needles can range in size from 0.5mm to 2mm. The procedure is also commonly referred to as "micro-needling." Activator is a handheld device with Titanium Alloy micro needles. When used with topical tonics and oils on the scalp, it boosts blood circulation and boosts absorption scalp absorption, improve efficacy. All this for faster results!