Which K’nex building sets are best? K’nex are educational construction and building sets that use interlocking plastic rods and connectors to build models, machines and architectural structures.

The highly rated K'NEX Kid Stretchin' Friends Building Set is only $10.17 (reg. $19.99) with this deal at Amazon right now! This is a great introduction to K'NEX building sets for preschoolers. Other ...