Description The art ruling pens can provide you with the ability to create beautiful straight lines to meet your professional painting needs. With these pens, you can be creative and draw beautiful designs. You can control the line width by adjusting the screw, tightening or loosening it. Feature-Color: As Shown-Material: Metal-Size: About 13.00X0.60X0.60cm/5.11X0.24X0.24in-Multiple functions: Designed for fine line drawing, technical drawing, cartography, and calligraphy.-Adjustable design: You can control the line width by adjusting the screw, tightening or loosening it.-Applicable people: Suitable for artists, painters, cartoonists, and people who practice drawing.-Compatible with ink: Suitable for drawing lines and drawings with ink or other drawing fluid or thin paint.-Warm tips: The pen must be perpendicular to the paper to draw horizontal lines evenly with force. Packing list: 3 x Art Ruling Pens