These ABEC 9 bearings are sure to give you speed that lasts and are built tough with their gold chromed steel outer rings to hold up against any type of riding. These bearings will have a perfect fit in each Rogue wheel every time. -ABEC 9 -Custom rubber shields with nylon cage -Chromed steel outer races -Outer diameter precision machined to 22mm -Inner race of Rogue Wheels machined to 21.9mm for a perfect fit every time -Spacer measurement 10mm -Each custom bearing package comes with 4 floater bearings and 2 wheel spacers