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