Is the following sentence correct?
I am writing to enquire whether you have available an e-paper display of size around 4".
What could "of size" be replaced with?
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First off, it's correct to say "an e-paper display of size around 4" as commented by David Richerby. But, according to grammar, the more appropriate preposition is "in". So it should be "an e-paper display in (a) size around 4".
Second, I don't think the use of the adjective "available" in the sentence is natural. I think the correct sentence should be as follows:
"......whether you have an e-paper display of size 4" available.
However, if the OP wants to get rid of the word "size", he can say "a 4" e-paper display" as replied by user 3169.