Derma Roller For Hair Growth and Facial Skin Therapy 540 NeedlesDerma Roller 0. 5mm with 540 Micro Needles for Hair Growth and Facial Skin Therapy Skin Care Beauty Tool for Anti Aging Skin Repair, Anti Wrinkle Skin Care, and Hair Growth & Loss Solution. Instructions for Use: Use a cleansing cream and tonic to cleanse your skin first. Apply the derma roller to the skin diagonally, from top to bottom and from left to right. As the needle moves across the skin, be careful to provide pressure to the area that needs to