These handy folders contain actual grains of sand to provide a pocket-size guide to sizes, shapes, roundness, and angularity. Availability: Usually ships the same business day Sand Grain Size Folder sagrsifo$7.25, 10/$67.50, 20/$125.00 Need more information? Please feel free to contact us at 1-800-592-6940 - Ask for Extension 547 or Internet Sales.