They absorb most of the accumulated kinetic energy on impact.
GN254-38-M8-10-55 Tapered Bumper Stainless, Nat.. Rubber, Threaded Stud GN 254 vibration / shock absorption mounts, also known as shock absorbing mounts, vibration mounts, anti-vibration mounts, vibration bobbins or rubber bumpers, are frequently used as end-stop bumpers, e.