9" x 12" centimeter grid that features an X-Y coordinate to help visualize, reinforce, and enrich graphing data collection. Each Kit Includes: 30 one-sided, dry erase marker boards (9" x 12"), 30 low-odor, fine tip, dry-erase markers (12 black, 6 each of red, blue, and green), 30 CleanWipe? Cloths (6" x 6"), Packed in a handy storage container.