Every item is assigned a freight class which directly correlates to the shipping cost. Every possible shipment has a class of either: 50, 55, 60, 65, 70, 77.5, 85, 92.5, 100, 110, 125, 150, 175, 200, 250, 300, 400, & 500. In general, the lower the class, the less costly (per pound) to ship.