KYB 343330 Excel-G Gas Shock twin-tubeTechnology, designed for European performance cars Specifically calibrated to help restore the original handling and control characteristics of your BMW Z Series Uses a seamless working cylinder matched with a Teflon coated piston band for a positive seal and longer life Triple chrome plated piston rod and multi-lip oil seals that reduce wear Solid seamless mounting eye rings and bolt bushings to eliminate rattles