Two Different Designs: Standard Model: This engine case slider for the fits neatly and easily to the existing engine case and will provide additional protection in the event of a drop. Designed using the very latest in 3D scanning technologies to ensure an exact fit, the product is made from HDPE (Black), the same material as used in R&G's industry leading Crash Protectors. R&G engine case sliders complement the R&G crash protectors.