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KEY FEATURES – Techno Gears Marble Mania Whirler STEM construction set features 80+ brightly colored interlocking pieces, base plates, 3-D connectors, a marble release, and a step by step instruction manual to guide you to the finished product. After the product is built, Whirler 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.