Roll of 8" x 25 ft netting. Spacing is 1/8"x 1/8" sq.  Perfect to build small size substrate for small containers.  Netting is strong, long lasting and perfect for Post Larvae to Adult Prawns.  This is the same netting I use for my Substrates.
To get an idea on how to build Substrates, please view my video on Youtube on Building Substrate.