OUR ADVANTAGES: Three-Point Positioning Design, simple, convenient, reduce asymmetry , easy for every day eyebrow makeup work. A very practical tool for microblading or tattoo artist. PREMIUM MATERIAL: Adopting high quality stainless steel material, this will be durable, lightweight, non-toxic and safe.Comfortable feel, It is fully reusable. WIDELY APPLICATION: With this ruler, it can help to make the eyebrow tattoo more precisely and easily. It's also a ideal for Biology & Art Students, Makeup Artists, Artists, Designers, Dentists and Architects GOLDEN RATIO CALIPERS: Measures the Golden Mean, also known as The Golden Ratio and Phi is a ratio of 1:1.618 that is considered aesthetically beautiful and frequently appears in nature and in the human body, particularly in the human face such as the size and position of the eyebrows. AFERT-SALE SERVICE: If you're not completely satisfied with your purchase for any reason,please feel free to contact us, we will solve the problem online for you 25 hours a day Simply let us know and we promise will solve it for you with whatever it takes