the 3X125mm Skating base is with 12.2'' inches 310mm length, support 3 125mm wheels;
the 4X110mm skating base is with 13.2'' inches 335mm length, support 4 110mm wheels;
the skating base is made of 7050 series Aluminium ally CNC, very light and strengthen;
the 4X110mm skating base is with 195mm mounting distance;
the 3X125mm skating base is with 165mm and 195mm mounting distance;
the price is for 1 pair skating base, we will send skating spacers and bolts as gift;