Description Suitable for fine line drawing, technical drawing, cartography and calligraphy, a perfect tool for both beginners and artists to draw and paint. The nib is covered with wax to rust and danger. High temperature may melt and redness. not rusty. It can be wiped off with a damp cloth. If you have , please feel free to and it will be resolved as soon as possible. Feature - Color: As shown. - Material: Special material. - Size: Approx. 13x0. 6x0. 6 cm. - Rulers are designed for technical drawing, thin line drawing, cartography and calligraphy. - Can also be used to make fine lines and borders in gouache, ink, painting ink, art masking fluid. - Great for drawing lines and drawings. - Right- angle pen cross- hinged to accommodate variable line widths. Line width can be adjusted. - Reminder: Dear buyers, due to monitor brightness, lighting effects, manual measurement, etc., there may be slight differences between the photos and the real objects. Sincerely hope you can understand! Thanks! Package Including 3 x Straight Line Pen Ciieeo 3pcs Metallic Paint Pens Pen for Drawing Calligraphy Ruling Pen Stationery Ruling Pen Drawing Pens Adjustable Liner Artistic Ruler Dip Pens Manga Straight Line Pen Mask The Cross Thickness Adjustment: You can control the line thickness adjusting the screws of the fluid line pen Dip the ink in the gap when using. The point of the art ruling pen is made of iron, enough for long time use, the pen- holder is made of plastic, lightweight and comforable for fine line drawing.