Pool Mate 1-3809-10A Cover Water Bags, 10-Pack, 8 ft. Blue Product Details Size: 10-Pack Color: Blue Material: Vinyl Brand: Pool Mate Style: Heavy-Duty (16 Gauge) - 8 ft. Model Name: Pool Cover Water Bags Item Weight: 12 Pounds Special Feature: Wear Resistant Theme: Swimming Pool Accessories Closure Type: Drawstring Pattern: Solid Product Care Instructions: Handle with care, clean with mild soap and water, and store indoors during off-season. Item Weight: 12 pounds Manufacturer: Pool Mate Country of Origin: China Item model number: 1-3809--10A 10-Pack Blue 8 ft. Double Chamber 16 Gauge Pool Cover Water Bags Heavy-Duty 16 Gauge Vinyl Construction - 30% Heavier Than Industry-Standard Double Chamber Design Prevents Rolling Prevents Winter Pool Cover From Falling Into Pool Fill Halfway With Water to Allow For Ice Expansion - If you have trouble closing the valve please use a hair dryer to loosen before closing. Pool Mate 8-Foot Winter Water Bags should be placed around the perimeter of your in-ground winter swimming pool cover. Simply slide these winter water bags through the water bag loops included on your winter pool cover. These water bags include leak-proof valves that are easy to fill with a garden hose. Only fill the water bag half-way, this prevents ice from expanding and splitting your water bag. Pool Mate water bags feature a dual-chamber design, preventing the tube from rolling into your pool during the winter. Made with Extra Heavy-Duty 20 gauge vinyl.