ART RULING PENS SET: You will receive 2 sizes art ruling pens 4 sizes rubber eraser and 4pcs plastic pipettes which can meet your drawing and writing need RELIABLE MATERIAL: The art ruling pens are made of iron durable enough for long time use the pen-holder is made of high quality plastic lightweight and comforable for fine line drawing. Rectangle eraser is made of natural rubber safe and durable in use elastic and not easy to break after pressing can easily and quickly remove the adhesive. SUITABLE SIZES: Contains 2 sizes art ruling pens: 130x18x7mm 124x8.5x7mm; rectangle rubber eraser in 4 sizes 70x50x6~8mm 82x22x10mm 82x22x10mm 50x35x8~10mm; 4pcs plastic transfer pipettes each 145x11.5mm capacity: 1ml ADJUSTABLE PENS: Dip the ink in the gap when using 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. WIDE APPLICATION: 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 prevent rust and danger. High temperature may melt and redness. It is not rusty. It can be wiped off with a damp cloth.