Vintage Magna Chart Column Heading MH 37 Magnetic - they are approximately 7/8” square. By MagnaVisual. Raised Numbers Are mismatched with black and white coloring on a magnetic backboard. Visual aids. Most Numbers Will on original board but are likely to move during shipping as they are not secured on it- just magnetically. see pictures. All numbers not present. A few duplicates and random pieces. Original set is missing the 1, 7 & 14. This set has 28 + 19. Great old find. See pictures. Sold as seen. Condition is "Used". Shipped with USPS First Class.