SF77 30330-CUSTOM KELLY'S is a Custom 3' x 330' 77G Fabric Slit Fence. SF 77 is a woven geotextile made of 100% polypropylene tape fibers which are woven into a stable network such that the yarns retain their relative position. SF 77 resists ultraviolet deterioration, rotting, biological degradation, naturally encountered basics and acids. Polypropylene is stable within a pH range of 2 to 13.