This is a powerful weight basis, also perfectly fixed bias your umbrella even in windy conditions. PE durable materials and excellent blow molding technology, to ensure weather resistance and long term use. The basis weight of the umbrella can be adjusted with 4-wheels, easy to move. The most important thing is that you can fill it with wet sand, it weighs 260 lbs. so as to ensure the stability of the umbrella. In addition, the easy to fill filling port can help you quickly filled, without wasting time. In addition, this basic counterweight frame has built-in drain holes for easy draining of water. Even better, this basic counterweight has a detachable cross base for easy use. The unique appearance adds elegance to your outdoor space, which is perfect for terraces, gardens, courtyards, porches and poolside. Color: Black. Material: Plastic.