Rivon Walling is the flattest individual pieces only come out about an inch or less. Corners are made by mitre cutting the flat pieces and gluing to them onto wall. Riven needs to be sealed to apply; and when decide to seal it the color will become much darker. Applying sealer would best be done with a spray tool; nevertheless, traditional human workship would also be fine.
Standard sizes (in mm):
Rockface/MachineCut Finish: 10x100, 10x150, 10x200, 10x300, 20x200, 20x300, 20x400, 30x300, 30x400, 40x400