Reinforced Graph-Ruled Filler Paper is double the strength with durable, triangle-shape holes & strong reinforcement tape that resists tearing. Patented, triangular holes are more durable & turn easily along binder rings. SFI-certified, heavyweight paper keeps up with all your projects & 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 & engineering projects. Scan, study & organize notes with the Five Star app. Create instant flash cards & sync your notes to Google Drive to access them from anywhere on any device.