You read the item upside down, it is 6000Z

6000-2RS Sealed Ball Bearing, 6000Z inner diameter is 10mm, and made of Chrome Steel, each Z0009 bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, the Z0009 bearing is pre-lubricated with grease.

• Item: Rubber Sealed 6000Z Ball Bearing
• Type: Deep groove ball bearings
• Closures: Rubber Seals
• Lubrication: Self Lubricated (Grease)
• Material: Chrome Steel
• Quantity: One Bearing