Kit Includes28'' Rear Diffuser with slotted holes for adjustmentHardwareAssembly and installation instructions Material 10mm Thick HDPE PolyethyleneFlexible and impact resistant. Finish Matte Black that matches any OEM trim black finish Gloss Black This diffuser is made from the same durable material than our splitters. With it’s 10mm thick high density polyethylene base and fins, this diffuser will add an aggressive oem + style to any cars or complete perfectly your Artwork splitter kit. The six fins are bolted from the back of the base plate and they are interchangeable if you don’t want the bigger fins in the middle as pictures.Please take measurements before doing your purchase to make sure exhaust don’t interfere. You can also see our 34" model here. Our 28" Version has a notch to accommodate central tow hook on many cars.