Provides a classic pen and paper experience, yet is built for the digital age. Although it feels like a traditional notebook, the Rocketbook Core is endlessly reusable and connected to all of your favorite Cloud services. When you write using any pen from the Pilot® Frixion line, your writing sticks to Rocketbook Core pages like regular paper. But add a drop of water and the notebook erases like magic. Pocket-Sized Indicator: No; Book-Binding Type: Spiral Coil; Book-Binding Details: Coil-Lock Spiral Wire: Flexible Cover; Book-Binding Edge: Side.