XRAY 930154 Ball-bearing 1.5x4x2 Steel Sealed Oil 4 Metal Bearings
Top-notch ball-bearings ID x OD x level (mm) = 1.5x4x2mm. Set of 4 pieces. These ball-bearings are degreased and incredibly very carefully oiled with AeroShell Fluid 12 oil for optimum smoothness, longevity, best limitation and maximum performance.