3 Size: S-12cm, M-12.5cm, L-13.3cm, you can different length according to your needs. Premium Material: The art ruling pen is made of stainless steel and plastic, durable and long lasting. Precision -hinged art ruling pen for masking fluid fine lines ink drawing tool. Thickness Adjustment: Ruling pen is -hinged for variable line width. You can control thickness by adjusting the screws of the fluid line pen. Design: The fluid line pen is a perfect tool 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 drawing, technical drawing, cartography and calligraphy. Applications: for ruling lines and drawing with ink or other drawing liquids or thin . It can also be used for making fine lines and borders in 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.