USA Pond Products - 18x20 Black/Blue Pond Liner-18'W x 20'L (5.49m x 6.10m) in 16-mil Black/Blue RPP (0.41mm) -Fish/Plant Friendly for Koi Ponds, Streams & Water Gardens - DLM Plastics, EPPDSHT-16BKBL-18X20

• This Flexible Liner is a flat sheet measuring 18 Feet Wide x 20 Feet Long that is made from 16-mil Black/Blue (RPP) Reinforced Polypropylene Example pond size for this liner: 10' Wide x 12' Long x 3' Deep with 1' Overlap Black or Blue, you decide the color you would like during installation This liner includes a rip-stop webbing that resists tears and punctures giving it extra strength while remaining lightweight. 16-mil Black/Blue (0.41mm) RPP liner material is very flexible and easily conforms to shapes and contours and is both Fish and Plant Friendly!