A shock absorber (in reality, a shock "damper") is a mechanical or hydraulic device designed to absorb and damp shock impulses. It does this by converting the kinetic energy of the shock into another form of energy (typically heat) which is then dissipated. Most shock absorbers are a form of dashpot (a damper which resists motion via viscous friction).
AVANTIZ/ EGO-LC FI REAR ABSORBER-BLACK-ORIGINAL
EGO S/ AVANTIZ REAR ABSORBER ASSY (YAMAHA GENUINE ORIGINAL)