This fillable patio umbrella base is made of high-density Hdpe with strong Uv resistance for all-weather durability. The 4-piece design works with cantilever and market umbrellas with cross bases up to 11 inches. Each plate has a sealed filling port for quick water or sand addition, plus built-in rear handles for easy movement. Total capacity holds up to 116.8 lbs of water or 147.7 lbs of sand, providing strong wind stability. The classic black finish matches patio, yard, pool, beach, lawn, and deck decor perfectly. Note: Cross base not included. Ideal for those seeking a durable, stable, and portable umbrella base solution for year-round outdoor use.