Shock body in high resistance steel alloy, both upper and lower attachments fully CNC machined from the top quality billet aluminium alloy. ADJUSTMENTS: spring preload with single micrometric ring, and hydraulic rebound (stepless adjuster ring). The linear or progressive springs are chosen and mounted according to the type of vehicle application. Springs are available in two colors, for different applications: 02 black springs - 03 chrome springs Also available for some models (Custom/Naked), the ‘lowered’ versions, shorter than original, indicated by the final “42” – “43”, and 'higher' versions “52” – “53”, longer than the original. The number 2 corresponds to the final black spring, the number 3 corresponds to the final chrome springs Compatible with: - Aprilia: Scarabeo 400_S, Scarabeo 500_S