Mobile Umbrella Base, Fillable Stand w/ 4 Wheels, 2 Locks, 120lb Capacity - BlackEASY MOBILITY: A set of four wheels let you move this base across multiple surfaces while two wheel locks help keep your shading in place STURDY ANCHOR: A heavy weighted base keeps your umbrella firmly in place resisting the wind while supporting your shade; weight with sand: 136. 70lbs weight with water: 94. 47lbs REFILLABLE RESERVOIR: Fill the hollow chamber with 120 pounds of sand or 38 liters of water, then use a pair of tightening knobs to secure