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mukltifunction derma pen needle for choices. it made by golden and silver alluminum stainless 304 material,safety and effective. the needle pin has non invasion tyoe and massage skin no nanometer needle pins, with rounds of nanometer needle with 80pin to help skin rejuvenation. it also have silicon crystal 3 x3 and 5 x 5mm derma pen needle cartridge uses a knead rod inlayed with numbers of needles, combining with functional nutrition liquid, regularly rolling in the places which needed to cure. 12 pins acne/pore removal /lifting; stretch mark reduction, stimulation of hair growth,whitening and administration of active ingredients..syi