How do I find / buy "pastry bars"?

In Moderist cuisine, they repeatedly refer to "pastry bars" for a number of techniques. However, when I try to search / find these things on the internet, my search engine results are hundreds of thousands of snack bars and other Kellog's "boxed products".
I've tried "baking bars", "baking weights" and a number of other variations.
Is there another name for these things that will help me find them?
Here's an image showing "baking bars" on a silicone mat to create a gel:
Best Answer
"Pastry bars metal" seems to work. The results I got were for "caramel ruler bars" or "ganache ruler bars". Other terms are "confectionery rulers" which gave me a forum that recommended getting them cut for you at a metal shop from stainless steel at whatever lengths you want for less than buying purpose made ones.
That said, I'm not sure that's actually what you're looking for. These seem to be bars for rolling out dough or fondant to a specific thickness, not designed to be used for shaping things the way your photo implies.
The term that I found that more closely resembles what you're looking for is "confectionery frames".
Pictures about "How do I find / buy "pastry bars"?"



I don’t buy puff pastry anymore! I’ve found out how to prepare it at home.
More answers regarding how do I find / buy "pastry bars"?
Answer 2
These look like simple aluminum profiles (in this case, hollow squares). Find someone selling aluminum bars/pipes etc by the foot/meter (maybe a DIY shop). Saw them to the desired size yourself and sandpaper the saw cuts (or ask a handy acquaintance).
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Designecologist, Scott Webb, RODNAE Productions, Artem Beliaikin