Use dry-erase markers to adapt these giant magnetic number lines to suit your needs. One set features an empty number line for complete customization. The other set features 28 hash marks in total which can be used as a traditional number line or can be used with our Jumbo QuietShape Fraction Tiles (Sold separately - click here) to explore fraction equivalency. Each set contains two magnetic pieces each measuring 20"L x 4"H for a total length of 40".