This base weight features four flexible wheels for easy sliding across your backyard, garden, or deck without scratching floors. No need for assembly. there are 2 inlets on the top for filling with water/sand, and 2 outlets on the side for draining the filling.Fill with at least 50% sandand inject 260 pounds of water. Made of durable PP plastic for weather resistance and UV-resistance.Finished 3D surface design in black, shaped in square, this umbrella base enhances outdoor spaces, surpassing traditional options. Ideal for courtyards, gardens, porches, or patios. Specifically designed for patio cantilever umbrellas, including offset umbrellas. Please ensure compatibility with the base size. For any inquiries or concerns, feel free to reach out to us for assistance.