There is only one kind of matter element. It may be modelled by a straight line's segment of unique constant extent (length) L. We call it the materion.
The materion is undeformable.
There is no mass, no electric charge or other physical property attached to the fundamental matter element.
Materions do not appear or disappear. There is conservation of the number of materions.
Matter elements (materions) only interact through contact. When materions are in contact, they refrain from crossing each other, either through collision (distancing or translational motion with a rotational motion depending on the point of impact) or through gliding (constrained translational and rotational motion of the interacting materions).
The materion is impenetrable.
Collision between two materions induces:
These are drafted assumptions. I still work on simulations to fit as near as possible to experimental evidence.
The main differences with respect to conventional physics are: