If this is your first time using Math U See, please be aware that you are required to use their specialized blocks with the fraction overlay kit. I bought two blocks sets from Demme learning so that my kids could do math at the same time without having to share them, and we like them so much were keeping them. The item "Brand New Math U See Epsilon Universal Set" is in sale since Saturday, October 9, 2021. This item is in the category "Books & Magazines\Textbooks, Education & Reference\Study Guides & Test Prep".The seller is "pastpeddler" and is located in Tempe, Arizona. This item can be shipped to United States.