the ball bearing 1,model number: 6000 series, 6200 series, 6300 series, 6800,6900series and so on 2, The material: carbon stee. and chrome steel( Gcr15) 3, Borediameter: 10-50mm, outside diameter: 26-110mm 4, Precision level: ABEC-1 5,Seals type: open/zz/2rs 6,the brand: we can do OEM service. 7,The packing: industry packingplastic tube and single box 8, the quality: low noise and high speed.