Built strong to last long. Take extensive notes and keep them organized in this unique notebook. The world's first refillable notebook features the patented TechLock system, a misalignment-free, break-resistant binding alternative that allows you to add pages as needed. Rigid plastic cover protects your work from spills and soil, while folding over to lay flat, allowing unfettered access to your notes. Pocket-Sized Indicator: No; Book-Binding Type: Hybrid Ring; Book-Binding Details: Three-Hole TechLock® Hybrid Ring: Flexible Cover; Book-Binding Edge: Side.