Help reduce spring noise in newer quieter cars with aftermarket coilovers by installing this set of 4 sleeves on the top and bottom first & last open coil. Each set covers the front or rear pair of springs in your true colover set so get 2 sets to cover all 4 corners of the car. We run two sets of these on our 63mm ID coilover springs while daily driving our lowered cars. The flexibility of this product means they could certainly cover other sizes and brands of coilover springs since they are flexible & universal but you would not want to use them on the extra large diameter OEM springs. The sleeves are super fast to install and they stay in place because they are lined with a strip of sticky adhesive as seen in the gallery's inverted photo with arrows. Holes release water to help prevent rust. What spring sleeves do: Provide a soft barrier between metal coils when the suspension compresses under heavy loads. Noise Reduction: They eliminate sharp clunking sounds when the flat base impacts the first coil winding. Paint and Rust Protection: They stop the spring coils from scraping off paint, which prevents rust and corrosion. Durability: Made from high-durometer rubber, these sleeves resist extreme weather, road salt, and heavy vehicle weight.