Can be used as a proportion ruler and are a key addition to your art design supplies. Ford design, item size: 16 * 4cm Made from stainless steel with satin finish. It is well designed and durable. The action is smooth and it will last a long time, will fit your needs perfectly. It also comes with a nice case that protects it from damage. The size is perfect and the accuracy is spot on, caliper will accurate from your checking to within a few tenths of a millimeter. The Golden (phi) Ratio 1: 1.618 . It appears many times in geometry, art, architecture and other areas. especially useful for human body dimensions. This caliper are also popular for measuring eyebrow dimensions. These calipers are accurate, are lightweight, and are well made. The caliper has been designed with our customers needs in mind. The curved style is comfortable for you to hold, easily adjustable, compact and light weight. It is fully reusable and can easily be sterilized. Color: Silver Material: Stainless steel Package Contents: 1 * caliper Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.