$25 to $50

How does a bridge stay up? Future engineers learn about force, tension, load and more while they build 20 awesome structures, with help from a fant...

There's something cool and soothing about pastel wood. These 20 lightweight pine 'stones' are both pretty and interesting, designed to capture imag...

If your tween or teen has a fascination with all things steampunk - or trains in general - then this kit is for them! Young engineers put on their ...

Totally marble-ous! Configure the colorful tubes and wheels creating an ever-changing series of fast tracks. A sturdy base and 45 pieces provide en...

A truly mesmerizing marble-track experience! Each set is made up of hollow stacking cubes and a variety of perfectly flat tracks. The paths cut out...

Stack hollow cubes to magically propel stainless steel marbles down a track for a truly mesmerizing experience! Eighteen special tracks grow wider ...

We hope youave missed unusual and peculiar mechanical models, because here comes the Monowheel rolling in to join your Ugears collection. Browsing ...