The Axon X10 Ball Bearing strives to uniformize ball sizes that are most important to ball bearings, and the thorough pursuit of every level of clearance to ensure that the high precision ball works optimally.
It is then applied to Axsons original coating and is filled with high temperature resistant CORE bearing oil MV which reduces resistance at high loads instead of grease filling to ensure maximum performance.
This product does not include batteries, batteries, power supply, etc.
(From Amazon.co.jp)