One of the most powerful features of the ERC is the ability to use
whatever materials you want! If you already have tubs full of K’NEX® or
other motorized manipulatives then go ahead and use them! If
you are looking for some materials to start or augment your supplies,
then the K'NEX® ERC Challenge Pack is a perfect start for 5-10
students.
Check out the specs for the K'NEX ERC Challenge Pack: