But Wagyu and Koby are not recognized trademarks in the US so any beef (including holstien) can legally be marketed as Wagyu. I'll admit that most often you will get prime Black angus but it is not the same as Wagyu. In Wagyu the fat has two differences. One, the marbling is in much smaller globules and it has a much lower melting point. I had a friend who visited Japan on food industry business tell me that when they gave him a small piece of Kobe beef fat to hold in his hand that after a minute it almost completely liquefied.