4 inch Air Suspension Spacer Kit (for use with single and double convoluted spring kits to add additional height for lifted vehicles). Pacbrake's air suspension spacer kits allow lifted trucks the use of air spring while still keeping them at their desired height. Made of high quality carbon steel and plated in Sleek black zinc protective coating, Pacbrake's spacers have been manufactured for maximum strength and corrosion resistance. Note For use Only with single and double convoluted Air Springs. Details: Size 4.0 Inch. Material Carbon Steel. Finish Zinc Coated. Pacbrake Series. Color Sleek Black.