Feature: 1. Made of high-quality aluminum alloy material, it has good corrosion resistance, not easy to rust, good density and easy to process. 2. It can be used to draw circular measurements, etc. Adjustable size. 3. This is an easy-to-carry plotter, precision gauge, which can be used in industry. 4. The quality of workmanship is beyond your imagination. Specification: Material: Aluminum alloy + stainless steel Diameter: 12.5cm/4.92in Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement. .