One  ball bearing with Ceramic balls, this is a popular size that could be used in many application that uses this size 20 x 37 x 9 mm. This ball bearing is made of Chrome  Steel, has Ceramic Balls, and is Metal Shielded  from both sides.

• Item: Double Shielded Ball Bearings
• Size: 20mm x 37mm x 9mm
• Type: Deep groove ball bearings
• Material: Chrome Steel
• Balls: Ceramic
• Closures: Metal Shields 6904Z
• Quantity: One Bearing
• Equivalents: 61904-2Z1 and 61904Z1 Bearings