HARDRACE Rear Trailing Arms ( Guide Rods )  with Pillowball inner joints. 

To Fit BMW E90 E92 3 Series

HARDRACE is a well known World established performance Suspension Manufacture. 
These trailing arms allow the adjustment of Caster in the rear wheels which can drastically effect the responsiveness of the car during hard cornering or drifting. The Pillow ball ends replace the OEM soft-rubber bushings which absorb too much energy that is then wasted... the result is a more direct feel with no energy lost in the suspension system.

Control Arms are made from High Density Steel 
Pillowball Bearings are TEFLON COATED for Certification Purposes

Control Arm is made from High Density Steel