The pen by Start International is a refillable pen for controlled application of liquid solutions. It can be filled with many different kinds of liquids (fluxes, alcohol, protective coatings, lubricating oil, inks, etc.). The fine tip of the pen allows for application in very small areas and is small enough to fit into a shirt pocket or repair kit. - The transparent cartridge shows the liquid level at a glance. Lightly squeeze the ergonomic barrel of the pen to control the amount of material being dispensed.