The heavy duty tubes look like what you find inside wrapping paper, but they are made from a much stronger cardboard that is ... tube that is often used for mailing things like posters and more.

Their designs are based upon heavy-duty cardboard tubes made from recycled paper, which provide a very strong and lightweight core. They currently handcraft kids tables and chairs and display ...

Large, heavy-duty cardboard cores can be cut into sections ... leaks that we had never noticed until we tested them. We had a tube of leftover caulk that we thought we would try to store in ...