Stainless Steel Ball Bearings with Ceramic Balls Premium ABEC-5 quality, 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: Double Shielded Ball Bearing
• Type: Deep Groove Ball Bearing
• Size: 4mm x 9mm x 4mm
• Inner Diameter: 4mm
• Outer Diameter: 9mm
• Width: 4mm
• Lubrication: (Dry)
• Material: Stainless Steel
• Closures: Metal Shielded
• Balls: Si3N4 Ceramic Balls (Silicon Nitride)
• Quantity: One Bearing