New Stable Steel Frame Design Our baseball screen is firstly a powder-coated heavy duty steel frame and secondly, the bottom frame has a bridge-like design for more stability on uneven ground. Finally, a button locking system is used to make installation easier. Durable Bridge-Style Steel Frame Black 4mm thickening anti-attack netting, make the baseball L screen super sturdy. Strong steel tubing with powder coating and the High-Strength, make the baseball softball protective screens durable and stable for pitcher season use. The bottom frame bridge design allows you to use it on uneven ground.More stable design! High-quality Pillowcase Netting The baseball screen with wheels made up of double pillowcase netting, which makes the baseball screen more durable to withstand huge batting power, sturdy baseball protective screen for pitcher batting pitching long time practice use.