High Quality Material: The parallel ruler is made of high-strength plastic, it is practical and durable, light, small and light, and it is easy to carry and use. Unique design: there is a round hole for every centimeter on the scale, which is easy to mark or draw a circle. There are different formulas on the roll, which is convenient for quick calculation in use. Easy to Use: The black scale of the tape measure is clear and easy to observe. The scale is marked in metric and inch, allowing you to perform unit conversion. Transparent Scale Ruler: The parallel line rolling ruler is made of transparent material, which allows you to draw without skipping some important graphics or text. Wide Applications: The rolling drawing ruler is an ideal choice for students, teachers, artists, designers and architects to draw and measure various geometric figures. Specification: Item Type: Versatile Roller Ruler Material: Plastic Size: 30 cm / 11.81 in Color: As Shown Quantity: 2 Pieces