Sandpaper
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Sandpaper, also known as coated abrasive or emery paper, is a type of material that consists of sheets of paper or cloth with an abrasive substance glued to one face.
Sheets of sandpaper with different grit sizes (40 (coarse), 80, 150, 240, 600 (fine))
320 grit silicon carbide sandpaper, with close-up view
Sheets of sandpaper with different grit sizes (200 (bottom)–40 (top))
Fish scale
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A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the
Sandpaper
…the surface rougher (for example, as a preparation for gluing). Since the ancient days, civilizations around the world used abrasive materials like fish scales or marble dust. The first recorded mention of a coated abrasive resembling modern-day sandpaper comes from 13th-century China, where crushed shells…
Cycloid scales cover these teleost fish (rohu)
Lobe-finned fishes, like this preserved coelacanth, have elasmoid scales.
The scales of this spotted gar appear glassy due to ganoine.
The alligator gar has a tough armouring of rhomboidal-shaped ganoid scales.