These are very strong tapes designed for reinforcing heavy boxes, strapping pallets together, bundling heavy objects (like lumber or pipes) or any other application that requires a very strong tape with an aggressive adhesive. They get their strength from fiberglass or nylon filaments. Generally they run the length of the tape but bi-directional tape is available.
The filaments in bi-directional tape run lengthwise and widthwise. This makes it ultra-strong for the heaviest loads. Bi-directional filament tape is also used for the construction of Hexayurts (scroll down for more information on Hexayurts).
They come in a wide range of different grades for any requirement.
These tapes are made from a special type of polypropylene that doesn't have filaments but is still very strong. The adhesive on some types is designed to stick to boxes but remove without causing too much damage. This makes them ideal for bundling pallets of material that need to look good after they are unwrapped.
Special no-residue material is available for use on appliances and other equipment that needs tape for shipping but must remove cleanly upon delivery.
What is a Hexayurt? Why does it need tape? The Hexayurt is a type of temporary shelter made from 4' x 8' sheets of plywood, rigid insulation, corrugated plastic or any other rigid, lightweight material. They go up fast and last for a few weeks up to a few years. They can be made using traditional methods but they can also be held together with tape. Bi-directional filament tape. They seem to be very popular at Burning Man.
If you want more information on how to build your own hexayurt go to the Hexayurt Project at: hexayurt.com/index.old.html or just Google it. They have designs, instructions and tips for building your own Hexayurt.