This is a Aluminum Smooth Tandem Axle Trailer Fender with a Tear Drop in the Center. This Style of Fender is very common on enclosed trailers, equipment trailers, and cargo trailers. Typically this fender would be mounted to the frame of the trailer with hardware (not included). These fenders are smooth aluminum, so they are light weight, and ideal for trailers spending a lot of time outside to prevent corrosion or weathering. This Fender measures 9 inches Wide x 72 inches Long x 20 inches tall. You will see from the product photos that this fender has one radius side, which would be the outer side, and one 90 Degree bend side, which would be the side that mounts to the trailer.