Masquepen Set includes pen, liquid & supernib. Masquepen allows you to apply masking fluid with exquisite detail. No more ruined brushes! Turquoise Blue masking fluid dries quickly, removes easily. The nib, a slender nylon tube, lets you make perfectly controlled marks as thin or thick as desired just by squeezing the plastic applicator. The supernib is an ultra-fine, hollow needle-like nib for applying Masquepen masking fluid with extreme precision. Only 0.5mm in diameter, it is great for making delicate linework and detail. To prevent clogging, it comes with a cleaning system; a solid needle for pushing out excess mask and a water-flushing squeeze bottle.