River Stone Pool Liner features the exclusive Unibead design. What is Unibead you ask? Unibead gives pool owners the ability to install this liner as a beaded liner (requires bead receiver) or as a J-Hook liner. All Pool City Unibead pool liners feature Perma material giving it the ultimate strength and durability Our virgin vinyl is formulated with inhibitors to protect against fading from chemicals and the suns powerful UV rays. Laser cut and radio frequency welded to exacting specifications our liners are sure to look professionally installed every time. 52 inch Standard Specifications To purchase this item follow this link: https://canadapoolwarehouse.com/product/river-stone-unibead-liner/