Most users of Apple phones or any smartphones can relate to surgical grade stainless steel.
In other words, most can relate to stainless steel alone and most can relate to even surgical grade as being one of the highest of quality of stainless steel.
I think the average user, however, does not relate to hardened or high tensile strength attributes.
We are talking about knowing the market you are addressing and addressing the market in their terms that they easily understand without a deep explanation.
Pretty simple, I think. This is coming from years of marketing experience.
Then, again, this is just my simple arse opinion.
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