This high-quality paper pad has an isometric grid of evenly spaced lines at 30, 90, and 120 degrees. For drawing 3-dimensional objects rotated at 45 degrees. Suitable for pencil or ink, with good erasing qualities. This multipurpose paper is also laser, copier, and inkjet compatible. Ideal for mechanical drawing or design needs, especially machine design, architecture, and patent office drafting. Sharp, dense images stand out on bright white background. Alvin has been the professional's choice for drafting tools and drawing supplies for over half a century. Since 1950, we have been known for our wide selection of high-quality products at a fair price. Our tools help bridge the gap between ideas and innovations.