Legal Disclaimer 
This product is not intended for use as a medical device. It is also not intended for use in the diagnosis of disease or other conditions, or in the cure, mitigation, treatment or prevention of disease, and are not intended to affect the structure or any function of the body. 0.3 mm is safe to use since it does not penetrate living skin layer such as epidermal and dermal layers of the skin. Actual product packaging and materials may contain more and/or different information than that shown in the listing We recommend that you do not solely rely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect that you have a medical problem. Amazon.com assumes no liability for inaccuracies or misstatements about products.
Directions for use
After cleansing the face as usual, sanitize your roller by dipping it into alcohol for 15-20 minutes. Then, carefully and slowly roll your skin in all directions, 3 to 4 times with your derma roller. Use roller only twice a week. After this process, apply 3 to 5 drops of our Vitamin C serum to your face with a dropper and gently tap your face until absorbed. And then, gently apply a small amount of Collagen Cream to the treated areas to calm and reduce any redness on sensitive skin. Lastly, dip your used roller into alcohol to clean and place disinfected roller into the case for future use. (Rollers are not recommended to be reused for use more than 10 treatments)