Can someone identify this brick? I'm looking for a kind of brick, the brand or the model, which has this specifications: The top has studs. The bottom doesn't have tubes. However, the bottom has support walls in the middle. Here is the picture:




What is the brand for this brickset (definitely not LEGO)? Is there a term for this kind of interlocking system?
I would say it it cold come from a brand from China, I can’t identify this system, but it is the opposite of that of a normal LEGO brick. It is still a normal 2x4 plate.