Foam manipulatives provide a way for children to learn concepts through developmentally appropriate hands-on experience. See and understand shapes within shapes, visual/spatial awareness, logical thinking, creativity, and math concepts. Write-on/Wipe-off with dry erase or damp wipe markers. Pieces easily punch out from an 8.5" x 11" standard size heavy duty die-cut thick foam sheet. Each set includes 18 pieces.