This is Maclan DRK 4-Pole Motor Ceramic Bearing Set (2 pcs) by Boca Bearings. These bearings have ceramic balls, with stainless steel races, retainers and shields.
- Fits Maclan DRK 4-Pole 6600KV motor.
- ABEC#5 rating
- Ball material: CERAMIC SI3N4
- Max RPM Rating: 75,000 RPM
- Comes with zero grease, works with zero grease
- Works best with Maclan Lightning Lube (by Boca Bearings)