XRAY has released Ball-bearing 12x18x4 Steel Sealed Oil 2 under Metal Bearings category
Top-notch ball-bearings ID x OD x level (mm) = 12x18x4mm. Set of 2 pieces. These ball-bearings are degreased and gently oiled with AeroShell Fluid 12 oil for optimum smoothness, endurance, best threshold and maximum performance. Fits RX8