The Rocketbook Core is designed for the classroom, office and personal mission. The Core is a reusable pen and paper notebook with dot grid templates that connect to cloud services. With 42 futuristic pages made with patented reusable?Core technology, the synthetic paper allows you to write smoothly with any Pilot FriXion pen, then wipe clean with a damp cloth to reuse again. For use with the free Rocketbook app to save notes and ideas to the cloud for organisation. Supplied complete with a FriXion pen eraser and cloth.