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Wooden Light Delay STEM Kit DIY Wooden LED Light Kit Wooden Gizmo Delay Light Kit Build Your Own Educational Light Delay Toy Spark Curiosity And Hands-on Learning - RS6440Wooden Light Delay STEM Kit DIY Wooden LED Light Kit Wooden Gizmo Delay Light Kit Build Your Own Educational Light Delay Toy Spark Curiosity And Hands-on Learning - RS6440