Hi 

I do not have the experience to know if these are flush corners or rounded hope someone can help

They are the set of 4 sizes from Amazon , Fat Daddio's 

Do you know if you can buy a 4 size set of chicago metallic squares .?

Thanks

ANot sure which ones those are. I have fat Daddio & love them.

My pans are not perfect square. There is a tiny bit of curve. Makes no difference. I get very sharp corners using my bench scraper.

I've never really understood why it's important to some people. The frosting doesn't sit close enough for the cake to help get those sharp edges.

I have the Fat Daddio 9" square pans and even though the corners are slightly rounded, my cakes still come out with fairly sharp corners that can be made even sharper with Buttercream.