A quark is a kind of elementary particle and a fundamental constituent of matter. Quarks combine to form hadrons, the most stable of which are protons and neutrons – the components of the nuclei of atoms. These glittery gel pens are named for the six different types of quarks.

1 mm tips

Each pack contains 6 unique colors:
Down 
Up 
Charm 
Strange 
Top 
Bottom

Learn more about using glitter ink on black paper here.