10-Pack 8x14mm Sealed Bearings 8x14x4 MiniatureBall Bearings 8x14x4 Sealed Lot of 10 Bearings High Quality 10 Ball Bearings , a standard bearing size with dimensions commonly used across many industries: 8mm x 14mm x 4mm. Bearings are can rotate up to 80,000 rpm, each bearing has 2 Sealed to protect the bearing from dust or any possible contamination, additionally, these bearings come pre lubricated with grease for smooth operation. Double Sealed Ball Bearings Size: 8 x 14 x 4 mm Deep groove ball