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Circle guide technique ?

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Hello.

I'm fairly experienced in Illustrator, but there's a technique that I can't seam to figure out.

Here the designers used some circles as guides. Very sharp and snapping the guide.

https://d13yacurqjgara.cloudfront.net/users/368240/screenshots/1784157/b...

My Problem:
I know how to make an object into a guide, but how do I get my objects curves to be as clean as the guides. I can do it by eye, but it's never exactly on point.

Does this technique have a name I can google or can somebody send me some tutorials.

Thank you.