50pcs lot 1 3 7 9 12 36 nano needle cartridges for dr. pen adjustable needle lengths for dermapen microneedles machine use

it uses multiple needles that vertically pierce the skin. the needle works for the dr.pen derma pen.and good price.protective cap each cartridge is sterilized and individually packed for dr. pen derma pen reduce sagging skin, age spots, scarring (including acne scars), unattractive large pores & sun damage. reduce deep-set and fine line wrinkles.