| Styrofoam Stak Tree 3D Shape Kit Introducing the Stak Tree! It's almost like magic - the Stak Tree starts out as a square of STYROFOAM(R) Brand Foam. The fun begins as you separate the block into stacking rings creating a cone-shaped tree. A fun project for kids and adults alike and the resulting tree is a great decoration for your home during the Holidays. 18 inches tall. Subcategory: Craft Basics |