540 titanium over stainless steel micro-needles. Available in 1.0mm for normal skin, .5mm for sensitive skin, and 1.5mm good for scalps or men with facial hair. The derma roller for the face has a smaller roller head to fit in smaller areas such as above the top lip and around the eyes. The ergonomically correct handle fits comfortably in your hand, while providing a safe, slip free grip.