Feature: 1. Precision wheels perfectly matched to accuracy with smooth rolling action to avoid damage to finished surfaces. 2. Adjustable pencil holder, holds any marker (2-12mm) so you can continue to use your preferred marker. 3. Ideal for drawing highly complex profiles such as baseboards, stone walls or architraves, ensuring a perfect fit every time. 4. Adjustable pencil holder to provide a range of tracing distance. Specification: Material: ABS Size: 23.3*3.5*2.7cm Color: as shown in the picture Packing List: 1*Writing Ruler (without pencil) Note: All products are measured by hand, which can avoid 1-2CM errors, but we will try to avoid error factors. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!