Magnetic Data Card Holders. Use our magnetic data card holders to organize and simplify your office planner or scheduling board. Each card holder holds a specific sized piece of paper or data card. You write or type out the information on the card and insert it into the data card holder. Now move the data card to the proper location within your scheduling board. Perfect for repeat jobs, functions or activities. The data card inserts come in a variety of colors and are all sold separately. The magnetic data card holders are available in 6 different heights from 1/2"" to 3"" tall in various lengths from 1"" to 12"" long. Also available in 50' long rolls that can be cut to size when and where you need them.