Precision -hinged art ruling pen for masking fluid fine lines ink drawing tool. Ruling pen is designed for fine line drawing, technical drawing, cartography and calligraphy. It can also be used for making fine lines and borders in Indian ink, gouache, and art masking fluid. Excellent for ruling lines and drawing with ink or other drawing liquids or thin paints. Ruling pen is -hinged for variable line width. width is set the screw adjustment. Colour:black+green Material:Metal + Plastic Package Contents: 3 x Art Ruling Pens Line 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.