Pre-made pcb, no soldering required..

Uses a rubber band to drive both sets of wheels.

Five syringes control all the movements typically found on an excavator..

Geared motor for extra power.

Includes a control box to activate the motion..

Includes a control box to activate the motion..

Does require sunlight to function effectively.

Battery, motor and propeller provide artificial wind to drive the power station.

Uses a worm drive for low gearing.

This simple arch bridge has amazing strength.

We recommend zinc batteries only..

Buzzer sounds if the movable ring touches the shaped wire..