The use of manipulatives provides a way for children to learn concepts through developmentally appropriate hands-on experience. Put the bones together and learn their names. Use over and over. Write-on/Wipe-off with dry erase or damp wipe markers. Each Magnetic Human Skeleton set includes 26 die-cut pieces that punch out from an 8.25" x 11.75" sheet. Sold as 6 sets for a total of 156 pieces.