Features:1. The arm's ruler can be used on various occasions with 360-degree rotation. 2. Lined with 2 scales for accurate drawing and cutting allowances for your project. 3. Made of acrylic materials with smooth surface and no burrs, which are durable and lightweight. Skin-friendly. 4. Compact design. You can put it in your bag to an art class, workshop, school, or stack in the hobby room at home. 5. Use it for measuring, sewing, drawing, and other creative projects. Suitable for art design, fractional measurement, building form work, architecture, network technique and more. Notice:Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Material: plasticSize: 10cm in diameterBattery: noColor/Style: Randomincludes:1 x 360 Degrees Protractor(only)