Unfortunately the answer is a vague "it depends." Commercial versus non-commercial is not clearly defined in actual law, and is usually up to the specific license to define what it considers to be commercial use.
If you were putting them on your business cards, then it's just being used for advertising and whether it's commercial use is a bit controversial. If the license explicitly prohibits the use of the work in advertising, then the license should explicitly mention that and should not rely on the term "commercial use" to cover or protect it. Creative Commons ran an excellent study on commercial versus noncommercial use back in 2009: Defining “Noncommercial” - A Study of How the Online Population Understands “Noncommercial Use”
In the United States, for example, the Copyright Act does not define a copyright owner’s rights in terms of commercial or noncommercial use. Instead, copyright law sometimes attaches legal significance to whether a use is “commercial” or “noncommercial” or whether a user is deemed to be a commercial or noncommercial entity, However, rarely are the terms defined, and the law offers no specific guidance on how to differentiate between commercial and
noncommercial uses or users of copyrighted works.
If you were putting them on a business card you were making for the client, then that would be more clearly identified as commercial use because you're using it in something you are selling for a profit. What your client will be using them for is not relevant, because you're the one selling them to the client and you need to have the right to be able to do that.