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by colejohnson66 2140 days ago
D’Addario has a “serial number” check webpage for their guitar strings. If you enter an invalid (or previously used) serial number, supposedly (I’ve never had a counterfeit set) they’ll send you a genuine set for free.

Sure, some people will input fake serial numbers to get a free product, but they probably weighed the cost of counterfeit strings affecting brand image (if I don’t know mine are counterfeit, I’ll assume it’s D’Addario’s fault if they’re bad) with the cost of sending a free set of $5 strings.