Constructed of heavy UV treated synthetic filament fiber. #42 (2.5mm) netting .  No-Sag" net system- netting hung on the square like tennis nets to eliminate/reduce sag. Extruded permanent black color and U.V. treated.  1 3/4" square mesh.  100% waterproof.  Ropes around perimeter and corners with three ropes running lengthwise on the top.  Great for pitching practice even using a pitcher's mound.  Outdoor and indoor use.  This is the Net Only.