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: