SR4ZZ Shielded Premium ABEC-5 Ball Bearing, bearing is Stainless Steel bearing SI3N4 Ceramic Balls, Bearing is made of Stainless Steel and has Solid Ceramic balls (SI3N4).

• Item: SR4ZZ High Speed Ball Bearing
• Type: Deep Groove Ball Bearings
• Lubrication: Dry
• Bearings: Stainless Steel
• Quality: Premium ABEC-5
• Closures: 2 Metal Shields
• Balls: SI3N4 Solid Ceramic
• Size: 1/4" x 5/8" x 0.196" inch
• Inner Diameter: 1/4" inch
• Outer Diameter: 5/8" inch
• Width: 0.196" inch
• Quantity: One Bearing