This added accessory for the Treasure Garden Art Deco or Garden style umbrella bases is made of solid cast iron. It screws onto the bottom weight of select Treasure Garden umbrella base stands to add 30 additional pounds of weight for added stability. Crafted from cast iron with a power coat finish, this added weight is easy to install or remove for the classic style aluminum clad umbrella bases, base sold separately. Recommend indoor storage in the off-season to protect the finish. This is an umbrella stand accessory, can not be used alone as an umbrella base.