From the kit description:
'Other building kits use motors, so what makes OLLO unique? you may be wondering. The difference is how OLLO pieces attach to one another. They attach with an innovative two-part rivet (one goes into the other and presses down to lock the pieces in place). And of course you can always undo the rivets (tool included) to build new and wilder things. The OLLO Action Kit is perfect for getting young minds interested in mechanics and building.
Here is the link for the OLLO - robotic action toy.