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KEY FEATURES – Techno Gears Marble Mania Slingshot STEM construction set features 80+ brightly colored interlocking pieces, base plates, 3-D connectors, a marble launcher loop, a windmill marble drop, and a step by step instruction manual to guide you to the finished product. After the product is built, Slingshot will provide hours of endless learning fun. Techno Gears products are all interchangeable which provides added play value and endless building possibilities! These marble run construction sets are perfect for BOYS and GIRLS ages 6 years and up.