Size: 6000ZZ (Inner Dia.=10mm, Outer Dia.=26mm, Thickness=8mm) Shields on BOTH SIDES of the bearing to keep dust out. Suitable for high speed operation Made from High Carbon Steel, durability and resistance to under heavy loads ABEC Tolerance 1 (P0) for most general use Same As 6000Z / 80100. Pre-Lubricated, Easy to maintain