acrylic-based hybrid ink, solvent-free, can be thinned with water and acetone, paint-like coverage, semi-gloss, quick-drying, good UV and weather resistance, waterproof and smudge-resistant, refillable (capacity: 5 ml), odourless, replaceable tip, pump-valve with patented capillary system, mixing ball in the paint tank, transparent plastic barrel, cap is the colour of the ink