The OEM Tops Engineering Computation Pad contains 200 sheets of 16 lb. paper, designed for easy diagramming with a five-square-per-inch, cross-section ruling. The front features frame margins, while the eye-ease green tint paper helps reduce glare and eye strain. This gluebound pad is three-hole punched for convenient storage in three-ring binders and has a sturdy 27 point chipboard back for writing support.