Foam Wheels are everyday items that provide you with the basic materials that you need to build your next STEM creation. We provide the " basics," but the rest is up to you, your creativity, and your STEM skills. Use STEM Basics to support your favorite STEM Starters Kit, or design and construct a STEM challenge of your own. Measures 1-5/8" x 3/8" . Each pack includes 40 pieces. Ages 3+.