All Bison aluminum Foul and Fair™ Poles are constructed of custom 4" square, rust proof 6061-T6 aluminum extrusions with extra internal ribbing for rigidity. Wings extend 16” and are fabricated of aluminum flattened expanded metal with an aluminum tubular frame. 12' poles are fully welded one-piece, 16' poles are 2-piece, and 20' poles are 3-piece with dependable connection hardware that adds rigidity to the poles. Choose direct bury mounting or semi-permanent removable mounting options.