XRAY has released Ball-bearing 10x16x4 Steel Sealed Oil 2 under Metal Bearings category
Top-notch ball-bearings ID x OD x level (mm) = 10x16x4mm. Set of 2 pieces. These ball-bearings are degreased and carefully oiled with AeroShell Fluid 12 oil for maximum smoothness, endurance, best restriction and maximum performance. Fits NT1