Complete fully-adjustable aluminum back upright set features back aluminum hubs, carbon fibre extension plates for camber website link alterations and eccentric roll center bushings for lower roll center modification. The eccentric bushings enable two various upper/lower roll center changes too two different inner/outer roll center jobs. The top of roll center position provides more traction in most conditions whilst the reduced roll center position makes the vehicle more free in corners and it is recommended for high traction conditions. The composite eccentric bushings can be easily exchanged once worn in the dusty conditions to reduce maintenance expenses. The upper carbon dietary fiber extensions are machined from lightweight carbon fiber to lessen the weight and feature 3 camber link positions. The aluminum uprights are stronger hence ensuring higher reliability and increased life time. CNC-machined from high-grade Swiss 7075 T6. The whole set includes outside 8x16x5mm ball-bearings and inner 13x20x4mm ball-bearings.