This derma roller has 0.3mm needle size and should be used in conjunction with the super serum. Use this lightly on the face once a week to revive skin and reduce pore size. Long-term use of the derma roller can improve the appearance of acne scars, wrinkles, discoloration and stretch marks. Please note that this derma roller should not be shared with others and cleaned after each use in an alcoholic solution. Store in a cool dry place in its box.