Put learning on the map. Spark student interest with interactive, versatile charts and maps. Reusable surface for customizing activities, projects, and presentations. 6-chart pack includes: Story Web, Venn Diagram, Numbers 1-100, Clocks, The United States, and The World. 17" x 22" each; learning activities on every chart back. For best results, use with TREND Wipe-Off® Markers (T98003 and T98004). Writes easy ... wipes clean. They're perfect for all Wipe-Off® products and most reusable surfaces. Wipe-Off® Markers have low odor, nontoxic ink with a durable medium-point tip.