Secure your pool cover with the Blue Torrent Hold Um Downs Pool Cover Water Bag Alternative - Set of 6. Simply fill the six bricks with water or sand and position them every five feet on top of your cover to hold it firmly in place. To ensure durability, the blocks are made from UV- and freeze-resistant polyethylene. Blue Torrent Blue Torrent touts its commitment to innovative design, and quality production. The company is comprised of swimming pool professionals with more than thirty five years of experience. The company believes in manufacturing products with the customer in mind. Blue Torrent Hold Um Downs Pool Cover Water Bag Alternative, 6-Pack BrandBlue Torrent Manufacturer Part NumberBS 22675 ColorBlack Assembled Product Dimensions (L x W x H)8.00 x 6.00 x 36.00 Inches