Manufactured from injection molded DURABLE PLASTIC. Modern textured matt black finish. Can be FILLED WITH SAND and WATER for maximum weight advantage. Perfect for patio umbrella's UP TO 11' DIAMETER or 10' x 6' rectangle. Strong POWDER COATED METAL STEM with adjustable tension screw and 2 internal adapter rings which SUITS MOST patio umbrella POLE DIAMETERS. Considered a PROTECTIVE UMBRELLA STORAGE COVER for your patio umbrella? Search B06XTZ76YG.