"The Brow Mapping String set comes with 3 boxes, each containing 10M long of pre-inked mapping thread. The thread is colored in white with cosmetic-grade ink which can draw sharp and thin straight lines on the face while the ink is easy to remove after the brow treatments are done. The Mapping String is a perfect tool for creating beautiful and precise brow shapes before Brow Henna, microblading and PMU applications."