Why? Your daily mission is anything but ordinary. Luckily there is a Rocketbook Orbit Page Pack for every phase of your journey. Not to mention, they are built for the bumpy and unpredictable ride! The metal loops that hold the Page Packs together are held snugly in place by magnets embedded in the Orbit’s backing. They are easy to pull out and swap packs, but strong enough to keep your pages safely secured. (Orbit clipboard not included.) When you write using any pen from the Pilot FriXion line, your writing sticks to Core pages like regular paper. But add a drop of water… and the notebook erases like magic. Letter Size: 8.5" x 11" Executive Size: 6" x 8.8" All Page Packs contain 20 sheets (40 pages front and back). Combo Page Packs such as "Dot-Grid / Lined" have one style on the front of the pack, and the other on the back. Orbit clipboard sold separately. Collect all Rocketbook Orbit Page Packs for every phase of your mission.