Alvin engineers field books are compact for on-site sketching and notes. Field notebook cover is extra stiff, has high-visibility yellow color, completely protected by a waterproof barrier with blind embossing. Pages are white ledger paper specially formulated for maximum archival service, ease of erasure, and protected by a water-resistant surface sizing. 4.75" x 7.25" page size, 50 sheets (100 pages), wire bound, plus 15 pages of curve tables and practical information. Left page has blue horizontal lines, red vertical lines, 6 columns. Right page has 8 x 4 blue lines, red vertical center line, 34 columns. Engineering notebooks are made in the USA.