Quality assurance guarantee - we offer a 90-Day Money Back Guarantee for a Risk-Free experience!. Versatile for any artistic style! Compatible with any brow mapping tool. The preinked brow mapping string helps enhance accuracy of many cosmetic procedures such as areola, scalp, eyes, eyeliner. A must-have product for cosmetic tattoo artists, salons, beauty schools and professionals. Precise Predraw = perfect fine brows! Our inked string is the thinnest string possible for surgical precision. Made of detoxifying bamboo charcoal, it is durable, disposable, safe for skin. Now mapping the face is easy and accurate with our pre-marked strings, superior to any bow mapping tool and all mapping markers on the market!. #1 in Microblading Supplies. With great value comes great... convenience! Each roll has 66ft (20m) of pre marked mapping thread, positioned inside a sealed box. A built-in cutter lets you get the correct string length quickly and easily. PRE-INKED! Strings are pre-marked with hypoallergenic cosmetic grade pigment. Save yourself time, and remember the "Three Free's": Stress-Free, Mess-Free, and Guess-Free!.