Tokico Premium Performance shock absorbers (aka "Tokico Blues") have a number of features not found in other shock absorbers. These features allow Tokico shock absorbers to provide a superior combination of handling, stability, and ride quality. Piston Rod Guide with TeflonĀ® coated bushing for minimal dynamic friction and good piston-rod life. Hardened, chrome-plated, and micro-polished piston-rod for long seal life and smooth operation. Twice drawn over mandrel pressure tube. Concentricity provides good sealing and minimal dynamic friction (drag). The heart of Tokico's shock absorber is their unique piston design. Tokico's multi-stage variable aperture sandwich valve system with its precision plates and precise orifice control, allows a flexibility of damping control not found in other shocks. Tokico shock oil is specially compounded for resistance to breakdown and minimal viscosity change regardless of temperature.