NO MORE WASTING GRAPH PAPER -the reusable Rocketbook Matrix graph notebook is perfect for handwriting notes, calculations, and drawing diagrams. BLAST YOUR PLANS AND DIAGRAMS TO POPULAR CLOUD SERVICES like Google Drive, Dropbox , Evernote , Box , OneNote , Slack , iCloud , email and more using the free Rocketbook application for iOS and Android. SHARE YOUR BRILLIANT WORK WITH COLLEAGUES , TEACHERS AND STUDENTS -the Rocketbook app scans and enhances your pages. Share digitally with anyone, anywhere. ERASE AND REUSE YOUR NOTEBOOK -Allow 15 seconds for ink from any Pilot Frixion pen , marker, or highlighter to dry in order for it to bond to our specialized pages - just wipe clean with a damp cloth to start over. SCIENTIFIC TEMPLATES AND FEATURES -Enjoy 30 graph pages with .25 inch grid format for precise diagramming. Also includes a handy one lined page for notes , one index page for organization, and built-in metric and imperial rulers for quick measurements