Undercover Canopy Gravity-Tube Ultimate Anchor Solution, Black 180 pounds of leveraged weight Fill with water, Sand or rock Fits most instant canopies Heavy duty PVC 22-liter tubes Quick tension-strap attachments Adds 180 Pounds of Leveraged Weight Fill With Sand, Rock or Water Fits All Canopies, Gazebos or Tents Durable Spyder-Claw Base (4) Heavy Duty PVC 22 Liter Tubes