These are custom, non-Lego endorsed, parts that are compatible with Lego Technics pieces. These should not be used in official MOCS, MODS, or models intended for Lego competitions. They are, however, suitable for custom Lego robotics parts (which is their intended purpose).
All money raised through the sales of these parts goes towards running the robotics program at Ulverstone High School, Tasmania, Australia. This will allow us to buy extra kits, upgrade our current NXT 2.0 kits to EV3 kits, parts, additional official Lego and 3rd party sensors, and any other equipment that will improve our resources.