1.)12 level adjustable damper. 2.)SCM440 hardened piston rod. 3.)Special formulated oil seal. 4.)Racing suspension fluid. 5.)Inner polished seamless steel tube. 6.)Mono-tube design. 7.)Advanced formulated rubber parts. 8.)Forged aluminum alloy top mount. 9.)SAE9254 spring. 10.)6061 t6 aluminum alloy plate. 11.)Height adjustable.(Patent:height scale indicator) 12.)6061 t6 aluminum alloy lower bracket. 13.)Enhanced pillow-ball top mount.(r3, r5) . 68*33*33 / 1 set.