Rugged Ridge Inner Fender Liners Frnt Aluminum Black 18-20 Jeep Wrangler JLRugged Ridge Aluminum Inner Fender Liners are a crucial element to building your off road beast. Crafted from lightweight 1 16 in. aluminum, CNC laser cut and bent for a perfect fit, these inner fenders protect your engine compartment from mud and debris and look phenomenal doing it. Designed to work with trimmed OE flares and most aftermarket fenders, these inner fenders give you that additional clearance you're looking for when running bigger tires.