Help me identify Rigid Plastic with adhesive back for bindery

[urville]

As you can see this tape is more rigid than standard tape. Almost like acetate with a sticky back but a tad softer. I need something like this, but it isnt something we have ever seen or encountered before in bindery and some of us have been at this, and have been with an impressive amount of shops over the years.

I really appreciate the assistance in advance!

 

[Stickman42]

Look at this page:

http://www.mcmaster.com/#uhmw-polyethylene-tape/=13r5r2g

 

[urville]

I will, right now, thank you.

Regular tape was allowing the magnets to flop over and not stay more rigid

 

[urville]

No Title

Can you think of anything else that might be a bit cheaper. I am trying to keep our cost ont hese as low as possible and these is some hand labor involved.
see attached picture

 

[urville]

Maybe Gaffer tape which is white but much cheaper?