Eyebrow mapping strings are pre‑inked in black and white, each featuring hypoallergenic bamboo charcoal pigment for precise, clean lines. Each 10 m (32 ft) string is ultra‑thin, allowing you to cut the exact length needed for symmetrical brow design. The ink transfers easily and can be removed with a cotton pad, keeping your workspace tidy. Perfect for professionals and enthusiasts seeking accurate eyebrow shaping.