Needle cartridge replacement for dr. Pen bio pen q2available in 4 options: 9 pin, 14 pin, 25 pin, and nano treatment indications for each needle type: 9 pin: reduces wrinkles and fine lines promotes skin firming enhances skin texture treats acne scars & other types of scarring reduces stretch marks addresses hyperpigmentation targets specific areas 14 pin: stimulates hair growth reduces hair loss enhances absorption of hair growth serums 25 pin: promotes skin firming improves skin texture treats body scarring reduces stretch marks addresses hyperpigmentation nano: promotes skin firming enhances skin texture rejuvenates under-eye areas key features: gold-plated fine gauge: ensures effective treatment. Easy compatibility: designed for seamless connection with the bio pen q2 microneedling pen. Customizable depth: adjustable up to 1.5Mm for a tailored treatment experience. Important usage instructions: precautions: do not use on open wounds, broken skin, or active acne. Discontinue use if irritation occurs. Single use only: dispose of the cartridge after one treatment. Reuse is not permitted. Sanitization: always sanitize microneedling cartridges before each use to ensure safe and hygienic treatment. Sanitization steps: wear gloves: to avoid contamination. Inspect needles: ensure the cartridge is in perfect condition, free from debris. Sanitize: submerge the needle cartridge in a 70% or higher isopropyl alcohol solution for a few minutes, or use a spray to sterilize the needl...