Rated at 10 x 13 ft this Lldpe pond liner covers 130 sq ft with a 20 mil thickness that resists rocks roots and animal claws across small backyard fish ponds water features and reflecting pools. The pliable Lldpe material drapes into curved pond shapes without cracking and the fish safe formula contains no toxic plasticizers so koi goldfish and pond plants stay healthy. Uv stabilizers protect the exposed edges from breakdown under direct sun exposure.