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Discover LudwigThe phrase "are principal" is correct and usable in written English.
It can be used in contexts where you are identifying or describing the main or most important individuals or elements in a situation.
Example: "The stakeholders in this project are principal to its success, as their input will guide our decisions."
Alternatives: "are key" or "are main".
Dictionary
are principal
noun
The money originally invested or loaned, on which basis interest and returns are calculated.
Exact(60)
Those three countries are principal sources of Iran's trade.
Textiles, frozen foods, and industrial equipment are principal products.
Among the top 25 orchestras, 11 women are principal flutists.
They are principal investigators of the biomarker study.
Plastics, shoes, and measuring instruments now are principal manufactures.
What follows is a slightly hysterical moment in which the kidney and I are principal players.
Of those, 37 are "principal" applicants and the remainder wives and children.
Rzeszów and Tarnów are principal industrial and commercial centres in the basin.
They are principal investigators of the Latino Immigrant National Election Study.
Ernst, 60, and Daniel, 30, are principal clarinettists of the Vienna Philharmonic.
J.A.E., K.A.H., M.R.M., S.K.R. and D.P.v.V. are principal co-authors of the paper.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com