- Isometric grid for precise 3D drawings - Smooth, acid-free 20 lb paper - Non-reproducible blue grid on one side - Ideal for mechanical design, architecture, and drafting The Alvin Isometric Paper Pad is an essential tool for drawing 3D objects rotated at 45 degrees. Featuring an isometric grid with evenly spaced lines at 30°, 90°, and 120°, this pad is perfect for mechanical design, architectural plans, and patent office drafting. The non-reproducible blue grid ensures clean, precise layouts while remaining invisible when scanned or copied. Printed on smooth, opaque, 20 lb acid-free paper, this pad provides a high-quality surface for sharp, dense lines that stand out against the bright white background.