Trail Armor's center skids for the RZR 4 800 are made of high density 1/2" uhmw plastic polymer. Because they are made of plastic, they are lighter than typical metal skids, and absorb the shock of impact - no dents and rust. This two piece set bolts up tight to the vehicle's bottom and does not hang down to get caught on obstacles. It protects from wheel well to wheel well, rolling up the sides (with the slider nerfs - sold separately) to safeguard the plastic rocker panels. Strategically placed drain holes allow dirt and debris to wash out for drainage and easy cleaning. Mounts easily in factory pre-drilled holes. Please note that the RZR 4 center skids include only the panels that run down the frame from the front differential across the center of vehicle to rear differential. The two side panels shown in picture are Trail Armor's slider nerfs for the RZR 4 which are sold separately. Fits years 2011 - 2014.