Premium Golden Mean Calipers are curved for accurate measurements. Fit for Biology, Art & Math Students, Artists, Tattoo, Designers, Bowl Makers and Architects. Measures the Golden Mean, also known as The Golden (phi) Ratio 1 : 1.618 . This caliper are popular for measuring eyebrow dimensions. It gives more precision to those who are in the initial stages of permanent face makeup. It is extensively used in Microblading and other beauty practices. Made from stainless steel for w/ satin finish. It is greatly designed and durable. The action is smooth and it will last a long for time, will fit your needs perfectly. It also comes with a nice for case that protects it from damage. Designed Golden Mean Calipers- Suitable for biology & art students, makeup artists, designers, artists, dentists and architects. Golden Ratio Eyebrow Ruler is portable and easy to carry with your cosmetic bag or purse. Specifications: Material:Metal Size:18x18x3cm/7.08x7.08x1.18in Note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 Pcs Golden Mean Calipers