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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! 40 pieces. 1⅝" x ⅜". Ages 3+.