General Yo - Aircraft Rated High Performance Replacement Bearings
These bearings are known for being incredibly smooth spinning and are Aircraft Instrument Gyro Rated so you know you are getting the best.
These come pre-cleaned of factory lubricant but with a drop of thin lube as standard. May require a short break in time to achieve unresponsive play, depending on your yoyo.
Currently only made in Size C (.250 x .500 x .187) - the standard sized used in most brands.