4 x 10 x 4 Stainless Steel Premium ABEC-5 Ball Bearing with Si3N4 Ceramic Balls (Silicon Nitride), Bearing is made of Stainless Steel, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, Ceramic Balls are the highest standard of balls that can make your bearings live at least 5 times more than any other bearings with Premium ABEC-5 quality.

• Item: 4 x 10 x 4 Ball Bearing
• Type: Deep Groove Ball Bearing
• Lubrication:(Dry)
• Quality: Premium ABEC-5
• Closures: 2 Metal Shields
• Material: Stainless Steel
• Balls: Si3N4 Ceramic Balls (Silicon Nitride)
• Dimensions: 4mm x 10mm x 4mm/Metric
• ID (inner diameter)/Bore: 4mm
• OD (outer diameter): 10mm
• Width/Height/thickness: 4mm
• Size: 4 x 10 x 4 mm
• Quantity: One Bearing