10-Pack 4x8 Sealed 4x8x3 Miniature 4mm Bore Bearing4 x 8 x 3 Sealed Ball Bearings Lot of 10 Bearings Set of 10 Ball Bearings 4 x 8 x 3, additionally, these bearings come pre lubricated with grease for smooth operation, each bearing has 2 Sealed to protect the bearing from dust or any possible contamination. 4 x 8 x 3 Ball Bearings Deep Groove Ball Bearings Size: 4mm x 8mm x 3mm Bearing Inner Diameter: 4mm Bearing Outer Diameter: 8mm Bearing Width: 3mm Shields: 2 Sealed Lubrication: Pre lubricated with