DURABLE CONSTRUCTION: Made of rugged, weather-resistant HDPE plastic, with molded injections and UV-protection to prevent cracking and material degradation VERSATILE BASE: Compatible with offset umbrellas equipped with a cross base up to 11 inches long, or conventional market umbrellas with a cross base RETRACTABLE CARRYING HANDLES: After emptying the ballast, utilize the included carry handles to move the base from the patio to the lawn and more INTERLOCKING PLATES: Keep your umbrella upright against heavy winds and prevent accidental damage from tipping over (NOTE: Umbrella and cross base not included) FILLABLE PANELS: Interlocking plates connect with four metal hooks and feature easy-to-fill spouts to hold approximately 160 pounds of sand or 115 pounds of water (total)