This H&O Direct movable parasol base has 2 wheels equipped underneath, which offer convenient transportation. Fill the base with either sand or water to increase its bottom-weight, so that the firmness can be optimized. You can adjust the amount of the filling according to your needs. Once the parasol is attached to the base, it can maintain sturdiness and stability. In this way, you can have a wonderful time in the shade without any concern. Our base is perfect as an umbrella base, no matter judging from its function or quality.(Tip This item requires assembly - H&O Direct HDPE Water & Sand Filled Parasol Base with Wheels（Pole is not included） in Black