This is a pack of four Align 500 6x12x4mm, MR126ZZ Bearings. These bearings are used in the main rotor holder, but are compatible with any application that uses a 6x12x4mm bearings.
Sunday, Jun 30 2019 (about a year ago)
Align 500 6x12x4mm Bearing (MR126ZZ) (4)
Amain commonly has everything I need down the last bearing. Another thing is the bearings never come brown/grungy from sitting on the shelf for years. Anything old they blow it out either online or the yearly swap meet type lot sales they do. Amain is great, but I suspect you heard