... in common way.2.disinfection of micro-needles with alcohol.3.After about 15minutes, put micro-needles end on your face and ... make more than 200,000 micro-channels, the active ingredients to effectively penetrate the skin, together with the wrinkle, whitening, repair ... minus 61 degrees Celsius freezing technology to create a micro-needle. Micro needle roller each microneedle can penetrate the skin, the ...