Item: 6903 Type: Deep Groove Ball Bearing Closures: 2 Seals Lubrication: Self-Lubricated (Grease) Color: Silver Material: Bearing Steel Size: 17x30x7mm Package Contents: 40 x Bearing Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.