Little Giant SLB-20100 20′ X 100′ Super Pond Liner (567305) 20′ X 100′ Super Pond Liner the PondWorks pond liner is a strong, 20-mil flexible material that allows for customization of size and shape. It’s durable, strong, lightweight and easy to maneuver. PondWorks liners are embossed to promote the growth of beneficial bacteria in your water garden. Every PondWorks liner comes with a 20-year warranty. Little Giant SLB-20100 20′ X 100′ Super Pond Liner (567305) Features: * 20 mil PVC * Puncture & UV resistant with a 20 year warranty * Extremely flexible – easy to install * Install with embossed side up for growth of beneficial bacteria * Underlayment not required * 15″ Diameter x 66″ Long x 3″ID Core