Remarkably versatile, this technical pen handles like a pencil, moving in all directions without snagging or digging in to the drawing surface. The stainless steel nibs of this pen is capable of achieving an engraver's perfection, a loose sketching style or a finely detailed pointillist technique.Details:Black ink0.35 mm nib size2 piecesRefillable ink systemWaterproof inkConforms to ASTM D-4236Stainless steel nibContents:Rapid Sketch penBottle of Rapidograph Ultradraw ink (0.75 fl. oz., 22.18 mL)