These are Ball Bearings from Tamiya.
FEATURES:
USAble with Tamiya's TT-01 chassis cars (Expert Built). Ball bearings are the most essential part for tuning up your R/C car. Enables heightened top speed and longer component life. Sealed, stainless steel ball bearing set. #1150 bearings are used with spur gears. #1280 bearings are used with differential gears.
YOU WILL RECEIVE:
(12) #1150 5 x 11mm Ball Bearings (4) #1280 8 x 12mm Ball Bearings
REQUIREMENTS:
To replace bearings refer to TT-01 chassis instruction manual kr11/27/02 &