#5 is 5mm across the closed coil with 5/8" tape on either side.
Tape is a very strong twill weave.
So much easier to use & much stronger than the #5 metal or brass toothed zipper that we've used for upholstery for years.
If you only need a few yards to complete a project, you may order 1 yard increments at #5 Coil. Just click on the picture.