For each size, it will have a rough. So we bring the sand paper each sizes cut into small pieces for endoscopy and Optical Microscopy using a photo shoot to show the structure of sand paper each sizes.
Each size would be roughly equal. We put each paper size, cut into small pieces to be used endoscopy and take pictures using the Optical Microscopy to see the structure of the paper sizes.
Each size is rough uneven. We took the sandpaper each size cut into small pieces in order to be a picture and by air Optical Microscopy to look at the structure of each abrasive size as follows.