Product Description Breathe new life into those nubs you’ve been saving and prolong the lifespan of your Blackwings with the Blackwing Pencil Extender . The simple design allows the extender to slide into the clip of the existing Blackwing ferrule and will work with any Blackwing pencil model. Each extender is made with machined aluminum and features a firmrubber tip to ensure a snug fit. How to use the Blackwing Pencil Extender: 1. Remove the eraser from your Blackwing pencil. 2. Insert the wide end of the Blackwing Pencil Extender into the clip and reinsert the clip into the ferrule. 3. Enjoyyour extended Blackwing pencil!