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.