Corrugated Paper Sheets

Corrugated Paper

Cardboard Sheets

Main Types of Corrugated Sheets

Single-face: 
One liner + one fluted medium (flexible, often used for wrapping or padding).

Single-wall (most common): 
Two liners + one fluted medium.

Double-wall: 
Two fluted mediums + three liners (much stronger).

Triple-wall: 
Three fluted mediums + four liners (very heavy-duty).

The flutes come in different sizes/profiles (commonly A, B, C, E, F flute), 
Larger flutes (like A or C) offer better cushioning.
Smaller flutes (like E or F) provide smoother surfaces and better printability.