Its the new invisisteel rotors just released. 15 grams per rotor. 300mm size! So Sweet you wouldnt believe it!.... Just swapped the wheels. Funny story... Got to San Remo to ride with the Scott 11 team and pulled my rear wheel out of my bike bag and OH Shit no rotor no cassette! Luckily the Scott Mechanic Mario hooked me up and was able to rip a few runs in with the crew!