This Skin Doodler Pen Holder is meant specifically to hold your Skin Doodler Pens. Skin doodler pens are made specifically for drawing directly on to the skin. They are made with a 1mm ball point and are 4.25" long. The pen holder is 4" long and 5/8" thick. This listing is for the Skin Doodler Pen Holder, pens are sold separately.