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The phrase "a hard shell" is correct and usable in written English.
It can be used to describe something that has a tough or rigid outer layer, often in a literal sense, such as a food item or a protective covering.
Example: "The turtle retreated into its hard shell when it sensed danger approaching."
Alternatives: "a tough exterior" or "a rigid casing".
Exact(51)
With some candidates there's a hard shell.
It plays, a little perversely, with putting on a hard shell.
In insects, a hard shell (chorion) forms around the eggs in the ovaries.
There is a hard shell of technical-sounding claims, jargon and appeals to high principle.
One of this species' favourite foods is the ostrich egg, which has a hard shell.
Social media could have fitted Kafka like a glove, or a skin, or a hard shell.
Similar(8)
But the headphones do come with a hard-shell case to protect your investment.
Each has a hard-shell pad backed with high-density foam.
Bob Bradley, who has worked hard to present a hard-shell public image, seemed animated and paternal behind the scenes.
In Frankfurt Airport, Leslie walked around holding the cat until she found a shop that sold a hard-shell carrier.
John Danowski had this strange thought the other day that he had become a hard-shell lifer coach, just like his dad.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com