They must’ve found a way around it. It is filled with all fluids. Oil, Coolant, Power steering, brake fluid etc etc.
It’s in my Aunts house right now and I promised her I wouldn’t get any oil on her garage floor so I haven’t spent time yet trying to drain those fluids.
Sorry, already took them off and converted my car from 26mm rotors to 30mm rotors. If you’re willing to take the 26mm rotors we can discuss a price.