During the mudiest and toughest Bartje 200 (so far) they were able to test them out properly and they passed flawlessly. Do what they are supposed to do and look nice too.
Wow!!! When we assembled them we made bets!.... They seem to have more metal than the factory ones, but... when we weighed them WHAM.... 60 grams per disc less! Great! And how they brake! :)