I have seen targets that are made of some type of board. They have all thread and 2x6s holding them together at the top and bottom. Does anyone know what the material is and where to buy it. Thanks

Cullen...I made one of those targets years ago.  It's just cardboard strips compressed between the boards.  Use to shoot it with my compound, works good too.

I have seen people use carpet or phone books too with all thread binding it together. I like to use rachet straps or bailing wire with carper strips stacked better,no metal to damage arrows.