SR144Z High Speed Stainless Steel Premium ABEC-5 Ball Bearing, The bearing is closed from one side Stainless Steel bearing with 7 solid SI3N4 Ceramic Balls, Bearing is made of Stainless Steel and has Solid Ceramic balls (SI3N4).Cage is made of Polyimides PI for lowest fricion and highest speeds.

• Item: SR144Z Ball Bearing
• Type: Deep Groove Ball Bearing
• Bearings: Stainless Steel
• Quality: Premium ABEC-5
• Closures: One Metal Shield
• Balls: SI3N4 Solid Ceramic
• Balls retainer: Polyimides PI
• Quantity: One Bearing
• Speed: 400,000 RPM