Apply inks and other liquids with these high quality, reusable, refillable markers. Liquids can be stored in the marker for later use or cleaned after each use. Markers come in a variety of sizes. Ball-bearings are included for shaking / stirring liquids. Nibs are spring loaded and allow the liquid to flow by depressing until the nib loads up. For acrylic paint markers, like Posca, use inks like Golden, Amsterdam, FW or AS inks. SEE INKS HERE Markers can also be used for watercolour and many other liquids.