Eibach spring rubber, durometer 70 (green). This spring rubber provides a firmer 70 durometer hardness intended for use with compatible coil springs, changing spring-seat compliance to slightly firmer response and helping isolate spring-to-seat contact. It’s a service or replacement component for owners adjusting rear suspension feel or replacing worn spring cushions without changing the springs themselves.
Eibach Spring Rubber - Durometer 70 (Green)