Set of two bearings Most common for electric scooters Shielded for longevity Ensures smooth rolling Here is a set of two 6000ZZ shielded wheel bearings for gas and electric scooters The 6000ZZ wheel bearing is also referred to as 6000Z, and is the most common wheel bearing used for electric and gas scooters Here is a set of two 6000ZZ shielded wheel bearings for gas and electric scooters. The 6000ZZ wheel bearing is also referred to as 6000Z, and is the most common wheel bearing used for electric and gas scooters. The number 6000ZZ or 6000Z is etched on the side of each bearing. Note that one complete set of two bearings is required for each wheel. Diameter (Outer): 26 mm Diameter (Inner): 10 mm Width: 8 mm