PREMIUM QUALITY - The Brow Mapping String is made of high-quality material, which is sturdy and durable, not easy to break. The ink is safe and non-toxic, and will not irritate the skin. The built-in cutter is sharp and easy to use, making it a must-have tool for permanent makeup artists. ALLERGEN-FREE INK - The ink is soaked in allergen-free ink, which is safe and non-toxic, and will not irritate the skin. The ink is also waterproof and smudge-proof, making it easy to see the marks on the skin. MULTIPURPOSE - The Eyebrow Mapping String is not only suitable for permanent makeup, but also for microblading. It can be used to map out the shape of the eyebrows, and to create the perfect shape for the client. The ink is also waterproof and smudge-proof, making it easy to see the marks on the skin and can be cleaned with makeup removal. EASY TO USE - The Brow Mapping String is easy to use. Soaked ink string is ready use it to draw the desired shape on the skin. The built-in cutter is sharp and easy to use, making it a must-have tool for permanent make up artists. VERSATILE - The Eyebrow Mapping Tool is versatile and can be used for a variety of purposes, including eyebrow threading, eyeliner, and lip liner.. It can be used to map out the shape of the eyebrows, and to create the perfect shape for the client. The ink is also waterproof and smudge-proof, making it easy to see the marks on the skin.