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This art ruling pen features a hardened nickel-plated nib with a spring blade design and green plastic handle. It is perfect for creating precise lines and drawing with ink, drawing and masking fluids or even thin paints. Product Feature: Accurate fine lines. A screw allows for the adjustment of the blades for line width. Over tightening the blades will stop the pen working. The ruling pen is perfect for applying masking fluid to your paper. Perfect for cartography, calligraphy, fine drawing and technical drawings. Suitable for use with artist masking fluid, drawing ink, Indian ink and gouache. Wash in soapy water after use and dry. Great for grasses, small branches, rope, and other fine detail. It is designed so that ink is drawn in between the blades by capillary action. How to use: It requires skill to use this instrument proficiently but once mastered, it can be used to draw beautiful sharp lines. When loading ink, rather than dipping the ruling pen directly into an inkpot, a fine brush or a dropper is used to gently place the ink on the inside surface of the blade. Application: It can also be used for making fine lines and borders in Indian ink, gouache, drawing ink and art masking fluid. The thickness of the line can be finely adjusted by turning the metal screw wheel.