Pen holder (or whatever you want to put in it) Tire stack of Pirelli P-Zero F1 tires. 6 3/4 inches high. My pens are all missing tops, so they fit, you may want to import into tinkerad at 110% or more to make it a little taller. I did use a wheel made by UnsungHero for one of his F1 models and messed with it to form a stack and a lid.