Firestone W56PL452020 EPDM Rubber Pre Cut and Boxed Pond Liner, Black, 20-Foot length x 20-Foot Width x 0.045-Inch Thick EPDM rubber pre cut and boxed pond liner Flexible for creative designs Environmentally friendly; fish friendly Easy maintenance; lasting beauty Measures 20-feet length by 20-feet width by 0.045-inch thick