These bearings can and have lasted up to 15 litres of fuel use in a nitro clutch.
They are a different type of bearing than all other nitro clutch bearings (not just a different brand).
These bearings need to be shimmed with 0.3-0.5mm of play and installed in the correct orientation.
Please check on this video from TKO for more information.
The bearings have (2) seals …1 Blue and 1 Black.
NOTE: BLUE seals face each other inside the bell.