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Why is the center hub of a C300 rotor a different material and why is it advised not to pick up the rotors by the hub. Any advice great appreciated. Thanks
 

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2008 AMG CLK63 Conv., 2012 R350 4-Matic, Wife's 2015 C300 sedan
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I don't know the C300 rotors well enough, but in general, if the rotors are of two parts, with an outer friction surface and an inner carrier riveted inside it, the intent is to allow for thermal expansion of the friction part (which will get very hot under braking) without warping the rotor as a whole. The rotor itself will often be of a relatively low strength material like cast iron (relatively cheap, easy to cast internal ventilation / cooling ducts into, and also a very good friction material), whereas the inner part will be a higher strength steel alloy (to carry the load and reduce overall weight).
The only reason I can think of not to pick them up by the center is in case the rivets can't take the weight if you pick them up flat.
 
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