The 944T hubs are cast. I don't know which grade aluminum alloy was used to cast them, but I can tell you that they are plenty strong enough for a VW Bug. They are very beefy units. I'm in the process of installing 944T brakes on my 70 Type 1 and I'm not at all concerned about the strength of the hubs. Remember, these hubs were used on a front engine car that weighed nearly twice as much as a bug.
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