The cantilever umbrella includes a weighted base The size of this patio umbrella is 12 ft, provides ample shade coverage. Double-top ventilation keeps cool in summer The crank system and unique handle design allow for easy adjustment of the angle. The 360-degree rotation feature provides versatile sun protection All-aluminum umbrella bones and 8 heavy-duty ribs, anti-oxidation spray painted, with LED light tubes, extension of time of use 240/gsm yarn dyed polyester fabric,UV 25, water-repellent and fadeless Fill at least 50% with sand and completely fill with about 280 Lbs of sand and water Purple Leaf patio umbrella offers you enough coverage to shade round. · The alloy steel we use for this offset umbrella makes it strong and durable, the anti-oxidation spray painted gives it a long period life. · The hand-crank system makes this offset umbrella easy to use, even if a child can handle it easily. We use 240/gsm polyester as the fabric of this offset umbrella, which means it is fade resistant and water-repelllent, also makes it be easy to clean. · With Purple Leaf patio umbrella, you can enjoy your outdoor life no matter it is raining or on sunshine days. Start your wonderful outdoor life!