ICE-Cube Thruster is so small that it can only be fabricated using techniques originally designed for making silicon chips

Imperial College is developing a rocket thruster called the Iridium Catalysed Electrolysis CubeSat Thruster (ICE-Cube Thruster) The entire thruster chip is about the length of a fingernail, with the combustion chamber and nozzle only measuring 1 mm long.

It also requires only 20 watts of electric current to operate and in a test campaign generated 1.25 millinewtons of thrust at a specific impulse of 185 seconds .