haha i made those, they have 3 layers of 5.7 oz carbon fiber in different directions, i run them on my viper, just remove the stock ones, the stock plates are made of galvanized steel, which is overkill IMO. I guess they are to protect the clutch but if there is something that is gona damage your clutch so bad that you need steel plates, you have bigger problems.
Im not sure on the exact weight I will weigh them tommorrow or thurs on a digital scale. But some say that 1lbs is equal to 7-10lbs of rotaing weight. im guessing they are close to a pound and the carbon ones are prob 10 times lighter.
I would apriciate others feed back on these pos or neg.