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The phrase "are of three" is not correct and does not convey a clear meaning in written English.
It may be intended to describe a quantity or classification, but it lacks context to be usable.
Example: "The options available to us are of three distinct categories."
Alternatives: "consist of three" or "are divided into three".
Dictionary
are of three
verb
Representing or , chiefly in depictions of colloquial speech.
Exact(57)
Chromatophores are of three kinds.
Moonquakes are of three types.
The masks are of three types.
Meteorites are of three kinds: stones, irons, and stony irons.
The skin glands of mammals are of three major types.
Injuries are of three main grades of severity.
Bonds are of three kinds: karma, maya, and avidya.
Martingales are of three types: running, standing, or Irish.
Similar(3)
Thus, it should be noted that the regions are of three-dimensional nature, although they are called "the interface" [1].
Despite a lot of theoretical work has been done for two-dimensional crack configurations in thermoelastic FGM, real defects and structural components are of three-dimensional (3D) nature.
Those suzerainties are of three sorts.
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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