Place needle head (with needles facing out) on the derma pen tip and push the head in while turning the head clockwise until the two openings on the needle head get locked into the two slots on the derma pen.
How often can I use the roller?
For beginners, rolling every few days can be done with 0.25mm or 0.3mm needle length only but it is advised to wait a few days for your skin to heal before another treatment.
For 0.5mm needle depth, you can use it once per week. For the 0.75mm or higher depths, you can use it once every 2-4 weeks and gradually increase to once per week.
ORA Electric Microneedle Roller Derma Pen Replacement Heads - 3 Heads Kit (For CORDED Version Only)