Vellum pad contains 50 sheets of 16 lb. vellum paper made with 100 percent cotton fiber. Unprinted paper is treated with high-impact oil resins to produce a permanently transparent drawing surface. Smooth white surface is suitable for pencil and ink. Acid-free, archival vellum pad is produced without solvents to meet EPA requirements. 16 lb.

Computation pad features a 5-square-per-inch, cross-section ruling printed on back that faintly shows through to the front. Front is printed with frame margins. Design makes diagramming easier. Three-hole punched pad has holes drilled in the left margin to fit in three-ring binders and is glue-bound along that side. Eye-ease green tint paper reduces glare and eyestrain. Letter-size computation pad contains 100 sheets of 16 lb. paper and has a 27 point chipboard back for writing support.

Isometric grid features nonreproducible blue 30-degree ISO grid with border to aid in scaling drawings in three main directions. Ideal for plumbing, heating and air conditioning, and mechanical design layouts.

Quadrille pad is ruled with 4 squares per inch for professional-looking creations. Precision ruling is even and consistent and delivered by a special, nonrepro blue ink. Heavyweight, 20 lb., white bond paper is ruled on both sides. Glue-top construction allows clean sheet removal every time with no loose sheets to get lost. Letter-size pad contains 50 sheets and offers a 27 point chipboard backer for writing support.

Quadrille pad is ruled with 5 squares per inch for professional-looking creations. Precision ruling is even and consistent and delivered by a special, nonrepro blue ink. Heavyweight, 20 lb., white bond paper is ruled on both sides. Glue-top construction allows clean sheet removal every time with no loose sheets to get lost. Letter-size pad contains 50 sheets and offers a 27 point chipboard backer for writing support.

• Acid-free
• Archival