CRAFTERS COMPANION- The Ultimate Pen Storage System will hold any marker up to 5/8" in diameter. Stack them to build horizontally, vertically or angled. Built with alcohol ink pens in mind, these racks allow you to store pens horizontally ensuring even ink flow to both ends. Each rack holds up to 12 pens. Measures 13.5cm x 24cm (5.30" x 9.5"). Includes one individual rack. Pens/Markers are NOT included.