18" x 24" guide-line®tri-fold foam display board, 3/16" thick. Lightweight and easy to transport. Size is 18"x24" open and 12"x18" closed. No need to measure, draw or erase lines- pre-printed, faint gridlines allow for perfect placement of photos and letters. Gridlines are easy to see up close, but appear to fade at a distance. This premium quality product is perfect for school projects, business presentations, charts and graphs.