This 0.38 refill can be used in many pens that use Parker-style refills. Featuring Jetstream ink, which is a hybrid ink that combines the great qualities of a ballpoint ink and a gel ink into one. This pigment based ink boasts the following qualities:
low-viscosity
smooth writing
quick drying (great for left handed users)
waterproof when dry
fade and forgery resistant
clean and vibrant color compared to other traditional ballpoint inks