I've purchased 2 flywheels, both have stated that they come from a type R model.

My research has led me to believe that a non-type R flywheel is around 8.4 kg
A type R one is about 6kg.

Is this correct?

I have two sitting in my room that both weigh 8.4kg.... starting to get real pissed off with peoples lies or have I got this wrong?