The CUBE-Notebook Edition is the result of a collaboration between Karas Kustoms and Dudek Modern Goods. Each CUBE- Notebook Edition is machined from a solid block of 6061 aluminum and features 3 black Delrin inserts, rubber feet, custom surface finishing, and high-quality engraving. All versions, except the Raw Machined Aluminum are rough tumbled so they will have some light surface detailing visible. The custom-machined inserts are pressed into the body of the CUBE and have a bore of 9/16” to accommodate most pens. The machined notebook slot is 0.8" wide to accommodate nearly any small notebook (or notebooks).The rubber feet keep the CUBE from sliding around and slightly elevate it from the surface it rests on, giving it the illusion of weightlessness. When, in fact the aluminum CUBE weighs around 1.85 lbs. This insures that your pens will be safe from being accidentally knocked over, or rolling off a desk. Each pen is separated and will not knock into each other, causing unwanted damage. Plus, you can safely display your pens and a notebook in a unique and organized fashion.