These high-quality, refillable empty markers have optimum flow control pump-valve systems that allow for accurate handling and application. The transparent marker bodies allow for easy color recognition and assessment of remaining content. The extra-fine 0.7mm markers hold 6-8ml of paint or ink. The fine 2mm markers hold 12ml of paint or ink. The standard 15mm, broad 30mm and broad 50mm nib empty markers hold 20ml of paint or ink.
When filling the markers, they should never be filled all of the way to the top. Some space needs to be left so the marker can be remixed by being shaken if the pigments settle.