4x7x2.5 Metal Shielded Sealed Ball Bearings MR74-ZZ (10 Units) 4x7x2.5 Metal Shielded Bearing MR74-ZZ (10 Units) RC Car Kit contains all upgraded bearings to replace your stock factory bearings and bushings. ABEC rated with Chrome Steel balls, Hi-temperature, low drag lubrication Maintenance free rubber seals to keep the contamination out and the grease in. Complete Ball Bearing Kits are custom packaged for your vehicle. Genuine FastEddy Bearings, The most trusted name in RC Bearings. Packaged in a quality reusable FastEddy resalable Bag. New FastEddy Bearings will allow your RC to run faster and longer then old worn out bearings.