Left.W/O QUADRA-LIFT. Right.W/O QUADRA-LIFT. A pleated and flexible protective device used over bare metal that collapses and expands with travel. Include: Dust Shield. Jounce Bumper. Boot. Cup. Damper. Duct cover. Dust seal. Isolator. Jounce. Shock. Spring Dust Shield. Spring Insulator. Suspension Strut Bellows.