These pond liners are 60 mil (0.060" thick) EPDM (Ethylene Propylene Diene Monomer). You can rest assured that your aquatic life will be safe, because these pond liners contain none of the algaecides & fire retardants found in roofing EPDM.
The following extra-large sizes are available:
10' x 100'
20' x 100'
30' x 100'
40' x 100'
50' x 100'
These large liners ship by truck freight which requires you to be present for delivery.