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 .7mm and fine 2mm nib
markers hold 8ml of paint or ink. The standard 15mm, broad 30mm and
broad 50mm nib empty markers hold 20ml of paint or ink.