Fish grade PVC is a synthetic vinyl pond liner that is highly flexible and easy to work with. It is light weight and easy to lie in place. PVC liner is susceptible to UV degredation and must be completly covered to protect against direct UV exposure. 20 and 30 mil FG pvc liner can be fabricated to custom dimensions, however to reduce waste we ask that one size of you liner be divisible by 6. We have provided a few common sizes for quick and easy ordering. For any other sizes give us a call and we will assist you in your custom order.