... 2.Model No. :6000 series. 3.Brand as customers' demand 4.Small order can be acceptable. 5.longer life Taper roller ... bearing,2. bearing type:roller bearings3. Cage(Retainer):Brass cage,nylon cage,steel cage4. Quality level:Reach the same level as ... :6300-63143.shield/closure;open bearing ,z,zz,RS,2RS,4.snap ring:N,NR5.Material:GCr15--china,(AISI) 52100--America ...