Monotube high pressure gas shock absorbers. The KYB Gas-a-Just Strut Assembly is engineered to significantly increase vehicle stability, handling and performance. Significantly increases vehicle stability, handling, and control over twin-tube designs. The KYB Gas-a-Just Strut Assembly is a more responsive mono-tube design that automatically adjusts to driving conditions and is an ideal upgrade from an OE twin-tube design. Product Features:Restores OE monotube performanceIncreases performance over OE twin tubeCompletely eliminates foaming and performance fadeUp to 30% more damping than twin tubeSingle, seamless working cylinder, heavy duty guagePhenolic piston seal provides consistent performanceAdditional floating piston separates oil and compresses nitrogen gas to add velocity sensitive performanceSeamless mounts and bonded bushings adds strength and eliminates noise