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The phrase "a certain size" is correct and usable in written English.
You can use it to describe an object or measurement that is not specific, but known to those involved in the conversation. For example: "The box has to be of a certain size to fit in the closet."
Exact(60)
At a certain size, you lose some of that.
The cup has to be a certain size.
"Beyond a certain size, China is disturbing," says one Eurocrat.
Plants over a certain size are also required to have a meat hygiene inspector.
Now, font is used to refer to a typed word at a certain size and weight.
"Once they get to a certain size they become counter-productive.
Currently, guidelines call for women to get chemotherapy if their tumors are of a certain size.
Tests showed that a container of a certain size is needed for an effective explosion.
Some firms will track only buildings over a certain size; others include smaller properties.
Flags and sponsor logos must be in a certain place and a certain size.
As in water, only bubbles of a certain size will survive and expand, smaller ones collapse.
More suggestions(22)
from a certain size
in a certain size
a certain waist
a precise size
a certain grandeur
a certain greatness
a certain importance
a certain length
a certain dimension
a particular size
a certain stature
a certain height
a certain magnitude
a certain extent
a clear size
a certain calibre
a certain significance
a certain breadth
a specified size
a selected size
a individual size
one particular size
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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