Our favorite new activity this year in the preschool classroom has been the Magna-Tiles. I have had my eye on these for years and this year made the investment. The best choice ever!! I am so glad I went with the 100 piece set. Since day one, the Magna-Tiles have been in constant use. While playing with Magna-Tiles the kids are using so many skills including design, math, creativity, science, building, and patterning.