The Wilwood AERO4 Rear Kit 14.00 Red 2007-2011 BMW E90 Series w/Lines is a performance brake kit designed to provide superior stopping power for the BMW E90 Series. The kit includes Wilwood's AERO4 rear calipers, 14.00 red anodized rotors, and stainless steel brake lines for a complete brake upgrade. The AERO4 calipers are lightweight and feature aluminum alloy construction for improved heat dissipation and better overall performance. The 14.00 rotors provide increased braking power and improved stopping distances, while the stainless steel brake lines provide increased durability and reliability. This kit is an excellent choice for those looking to upgrade their BMW E90 Series brakes.