Great Gizmos Dam - 4M - 5603265 - Construction set - Kidzlabs - Science Magic - Minimum age: 8 years Requires batteries: No Product description: 4M Kidzlabs: Science Magic, accessories and contains detailed instructions to perform 12 science tricks, Box 17x22x6cm , 8 +. Educational values: Imagine, invent, create, Publisher: 4M