There is also a corner connector made from vinyl that I cannot find a picture of but look like these metal ones.
And of course the pond netting.
I used 3/8 inch and double layered it. I had it single layered but my first yellow Head Jawfish jumped right through it. So now instead of one layer of a 3/8 inch square opening in the net i have the two layers crossed so that the square is a box with a X in it. You can see what I mean in the picture.
You can order 1/4" pond netting on line, however I did not only because I did not know if the fish would still be able to launch itself through the square hole. I was really surprised one day when my wife had my 2 year old granddaughter call me at work and tell me that the new jawfish was all dried up on the carpet!