Notebook Pen Slot Concept by Liao Hua & Wang Wei keeps your pen handy. Notebook Pen Slot incorporates the simple revision to the typical notebook spine, setting up a niche in which a pen can be securely kept. A pen-length part of the notebook’s paper investment is cut away at the centre of the spine. The actual cover is mounted on the paper just at the best and bottom from the spine. Closing the cover entombs the pen in the spine.