Fill cartridges, flush pens, and transfer inks between containers with our Blunt-Tip Ink Syringe. We make our ink samples with this model, a sturdy 5 mL syringe fitted with a 20 gauge dispensing needle. Dispensing needles aren't sharp—they're just narrow metal tubes, similar to the ones at the end of mechanical pencils. Printed with graduations from 1 mL to 5 mL. Although the syringe is printed "discard after use," it's perfectly fine to re-use these for inks. We clean ours out with Universal Pen Cleaner between colors. (You can unscrew the tip to get all the ink out with pen cleaner.)