Sportaflex Baseball - Grass 330'/530LF No Spring A modular, portable, lightweight fencing system designed for use on athletic and recreational playing fields. Rugged, corrosion-resistant aluminum construction with flexible mounts provides years of use. Breathable polyester vinyl mesh resists harsh weather, UV rays, abrasions, rot and mildew — easy to clean. Meets all relevant ASTM safety standards. Height – 4.5′ .