More importantly than what you may call them, are the materials used between the different automotivemanufacturers clearly defines the difference between the types of splash guards available today. Many mass produced and OEM mud flaps are typically made from a high tech plastic, contoured and cover minimal area of the tire. This type of mud flap is subject to breakage in extreme temperatures and doesn't offer much anti-spray protection. All- rubber splash guards offer more flexibility but tend to sail up, defeating the purpose. All metal, usually stainless steel, are prone bending or being easily dented. At this point, you'll probably asking yourself why isn't there a be better mud flap available?