117PCS Gear and Axle Set for Technic Parts Compatible with Mainstream Technic Parts, DIY Gears Assortment Pack(Gear Rack and Worm, Pins, Axles, Connectors) for Technic Building Blocks Set

My 7 year old built the full engine in the instructions, took it apart, and started incorporating the parts into other designs. He made motorcycle V-twins and inline 4s.These parts were perfect. The instructions, which were discarded, were not too easy to follow.

Good value for being an off brand. If you need to use them in pairs don't pair it up with the brand name because they do move at different speeds.

Pieces don't want to fit together for the gearbox, going to try the engine if it have the same issue then I will send it back for a refund.

Put together a good bit of Lego technic cars and this is an extra peace of mind, perfect fitmat and nice product when you are shorted pieces.

The power these small pieces pack was above expectations

My son was so excited to receive these for Christmas but the longer rods didn’t work. Will be returning these items

The media could not be loaded. The gears get stuck. It doesn’t work well.

My son loved building this little engine. He was hesitant to buy it with his birthday money because some reviews said the engine didn't function as they'd hoped. His went together and works nicely. He was very happy with his purchase.