This 25 pack of corrugated cardboard sheets is perfect for many different purposes like serving as cardboard inserts, corrugated packaging pads, or cardboard dividers. Put a sheet in a mailer to protect a piece of paper so it does not get bent in the mail. Use it as a backing for craft projects, or even make your own photo frames! You can also use them to make signs with markers or paint. Our card board sheets measure 12 x 16 inches, 1/16" thick.