3 Size: S-12cm, M-12.5cm, L-13.3cm, you can choose different length according to your needs. Premium Material: The art ruling pen is made of stainless steel and plastic, durable and long lasting. Precision cross-hinged art ruling pen for masking fluid fine lines ink drawing tool. Thickness Adjustment: Ruling pen is cross-hinged for variable line width. You can control the line thickness by adjusting the screws of the fluid line pen. Design: The fluid line pen is a perfect tool for you to draw a straight line. Dip the ink on the crevice of the art ruling pen, make the pen perpendicular to the paper. Ruling pen is designed for fine line drawing, technical drawing, cartography and calligraphy. Applications: Excellent for ruling lines and drawing with ink or other drawing liquids or thin paints. It can also be used for making fine lines and borders in Indian ink, gouache, and art masking fluid. Colour:silver Material:stainless steel + plastic Package Contents: 3 * ruling pen Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.