4 Pieces Adjustable Art Ruling Pen,Bill Duck Pen Straight Line Drawing Tool For Masking Fluid Fine Lines Painting(117,118,119,120)

Quantity:4 pieces of art ruling pens in a pack of 4 sizes, 1 piece per size, you can choose according to your needs. Material:Made of high quality metal, durable and anti-rust. With bill duck design, sharp and easy to use. Adjustment:Ruling pen is cross-hinged for variable line width. The line width is set by the screw adjustment. Usage:Dip the ink in the gap of the art ruling pen and the pen must be perpendicular to the paper. Suitable for watercolor painting, enable the user to create very fine lines that are masked from the paint.