All of the pens are filled with black pigment ink which is permanent

useful for cross-hatching

The compact 75 ml glass bottle suits field sketching

so closing the notebook right after writing won't smear or ghost onto the facing page

sticking hard to the surface and refusing to come off

caran dache goliath ballpoint refill cartridge fine Remio All of the pens areCaran d'Ache Goliath Fine Refill delivers ultra sharp precision for everyday writing. Engineered for writers, note takers, and illustrators demanding delicate line weight without sacrificing silky flow. Fine tip (0. 7mm) stainless steel nozzle produces tight, clean lines. Rotating tungsten carbide ball prevents scratching, ink blobbing, or skipping. Premium light resistant oil based ink handles extreme climates without drying out. Fast drying formula.