ORA's replacement heads are designed to replace the fine needle tips in your Electric Microneedle Roller Derma Pen to provide you with a 100% pain-free experience with professional results, all from the comfort of your home. The replacement heads vary in length from 0. 25 mm to 2 mm. Key Benefits:Reduces wrinklesBoosts collagenReduces the appearance of fine linesReduces scar appearance | Beauty ORA Electric Microneedle Roller Derma Pen Replacement Heads - 10 Heads Kit (For CORDED) version only) 10 piece | Dermstore