Frame sliders / plastic body protectors (one LHS and one RHS) that fit 08 Suzuki Hayabusa. The sliders are made of Delrin Acetal plastic-An engineering thermoplastic with good strength, wear resistance and dimensional stability. It is more dimensionally stable than Nylon and used in many industrial ball bearing and friction reducing applications. The bolts are made of highest grade comercially available 12.9(177,000 psi in tensile strength). The brackets are made of solid steel finished in black powder coat. The cross bolt is made of 304 stainless steel. The aluminum spacers are made of 6061-T6. Rest assured that you are getting the best material commercially available.