[PACKAGE AND SIZE]: Come with 3pcs art ruling pens in a pack of 2 sizes, pens are in length of 4.8/5.3 inch individually. 3 sizes glue residue eraser(3.2 x 0.9x 0.4; 2.8 x 2x 0.4; 2 x 1.4x 0.4). [RELIABLE MATERIAL]: The point of the art ruling pen is made of iron, durable enough for long time use, the pen-holder is made of high quality plastic, lightweight and comfortable for fine line drawing. Different sizes of rubber meet a variety of wiping needs. [ADJUSTABLE PENS ]: You can control the line width by adjusting screws, tightening or loosening them to draw right line, loosen the screws after use to avoid deformation of the line pen. [EASY TO USE ]: Dip the ink in the gap when using. If you want to draw a straight line, the pen must be perpendicular to the paper and draw a horizontal line with even force. [WIDE APPLICATION]: Suitable for fine line drawing, technical drawing, cartography and calligraphy, a perfect tool for both beginners and artists to draw and paint.