This light-weight pen accommodates a variety of needles. The needle securely screws on the thread providing the technician stability. It's specially designed flat head allows pen to stand upright, leaving the needle free of any debris in the air. Always hold the brow pen at a perpendicular angle to ensure the proper ‘twist and drag’ of the needle prongs. Do not sway side to side! Otherwise hairline strokes may be jagged or doubled. This brow pen is highly recommended for micro-blading experts.