TOPS™ Engineering Computation Pads are the starting point for professional diagrams and plans. Grid-to-edge 5 x 5 cross-section rulings on back show through clearly to provide scale and structure. Margin lines and heading bars on front provide standardized formatting on every page. Each glue-topped, 3-hole punched pad features low-glare tinted paper to help reduce eye strain and fatigue. Grid-To-Edge Format. Pocket-Sized Indicator: N; Pad-Binding Type: Glued/Gummed; Pad-Binding Edge: Top; Number of Subjects/Sections: 1.