LF-940ZZ Flanged Shielded Miniature Bearing 4x9x4LF 940 ZZ Ball Bearing 4mm x 9mm x 4mm Flanged Bearing One Bearing LF 940 ZZ High Quality Flanged Ball Bearing , this is a popular size that could be used in many application that uses this size 4mm x 9mm x 4mm. Bearing is made of Chrome Steel and can rotate up to 80,000 rpm. Item: LF 940ZZ Flanged Double Shielded Ball Bearing Size: 4 x 9 x 4 mm Type: Deep groove ball bearings Closures: 2 Metal Shields Quantity: One Bearing