Description: 【Material】: The Ruling Pen for Masking Fluid features a sturdy iron tip for long time use, and the pen body is made of plastic for a lightweight and comfortable fit. It's ideal for drawing precise, fine lines 【Adjustable Line Width】: The asking Fluid Pen easily controls line width with an adjustment screw mechanism. Tighten or loosen the screw to achieve your desired line thickness, and remember to loosen the screw after use to maintain the pen's shape 【Ease of Use】: The Art Ruling Pen is easy to use; simply dip the pen into the ink well before use. To draw straight lines, hold the pen perpendicular to the paper and apply even pressure for smooth, horizontal strokes 【Versatile Application】: The Fluid Line Drawing Tool is suitable for fine line art, technical drawing, drafting, and calligraphy. This tool is ideal for beginners and artists looking to improve their drawing skills 【Comprehensive Set】: Includes a set of four Straight Line Pen in different sizes to suit different artistic needs and preferences Size Chart: 14.5cmx0.98cmx0.5cm/5.71inchx0.39inchx0.20inch 13.6cmx0.68cm/5.34inchx0.27inch 12.63cmx0.69cm/4.97inchx0.27inch 12.28cmx0.7cm/4.83inchx0.28inch Package Includes: 4 Masking Fluid Pens Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!