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I ordered a set of Raybestos rotors and when they came in I was surprised with their weight so using a bathroom scale, totally unscientific but still ballpark, I weighted them and found that they are 28 lbs each. So if they are significantly heavier than OEM I will sell/return the Raybestos and pick up OEM.
It was around 12kg (also with bathroom scale and give or take a few decimal points) when I weighed mine some time ago. 28 lbs is approx. 12.7kg and I'd say they are in the same ball park.