4x8 Shielded 4x8x3 mm Miniature Bearing Pack of 10MR84ZZ Shielded Ball Bearings 4mm x 8mm x 3mm MR84ZZ Shielded Ball Bearings, the inner diameter is 4mm, outer diameter is 8mm and the width is 3mm, Bearings are made of Chrome Steel, each bearing has Double Shielded to protect the bearing from dust or any possible contamination. Item: MR84ZZ Ball Bearings Type: Deep Groove Ball Bearings Shields: Double Shielded Lubrication: Self Lubricated (Grease) Dimensions: 4mm x 8mm x 3mm Metric ID (inner