Every Brow Artist knows perfect symmetrical brows require mathematical precision. Our Pre-inked Eyebrow Mapping String is the ideal tool to use before Brow Henna, PMU, and Microblading applications. It can easily map the perfect brows and create symmetrical, straight lines on faces. The thread is colored with cosmetic-grade ink, which is easy to remove. With this mapping thread, it's never time-consuming again to deliver perfect brow shapes.