Reinforced Graph-Ruled Filler Paper is double the strength with durable, triangle-shape holes and strong reinforcement tape that resists tearing. Patented, triangular holes are more durable and turn easily along binder rings. SFI-certified, heavyweight paper keeps up with all your projects and fights ink bleed, maximizing both sides of the page for note-taking space. Loose-leaf, graph-ruled sheets feature 4 squares per inch for graphing, charting and engineering projects. Scan, study and organize notes with the Five Star app. Create instant flash cards and sync your notes to Google Drive to access them from anywhere on any device.