Replacement brushes for the Flex orbital buffer #XC3401VRG and the Flex rotary buffer #PE14-2-150. These brushes are more expensive than most because of their auto-stop feature. The brush has a spring and a pin which are embedded in the carbon. When it wears to a certain point, it disengages from contact with the armature, shutting the tool down , allowing no damage.
This item is priced and bought by the each. Each buffer takes 2 brushes. You will need to order 2 to make up a set to repair your buffer.