Finally i have the exactly info.
the saddle weigh 200g not 100 as mentioned, also it is not a carbon one but instead is the plastic version with manganese rails. On internet is priced around 66€ plus shipping but i think i got a fair deal since he said to test it before and then if i like it the price is 30euro. I think is fair enough. But sadly i also think he got scammed because the seller told him is the superlight version but it not. Thanks all for infos