You have spent the Time, Effort, and Money--so protect your investment with Brothers Performance Coil Spring Isolators. New Coil Springs are not complete without Brothers Performance New Spring Isolators. Whether you're Racing or Restoring, you will quickly notice the Crushed, Cracked, and Destroyed Original Rubber Isolators. Rubber is not capable of Withstanding the Pressures created in a Race environment by Heavy-Duty Springs or the battle against Time and Road Contaminants. These new Spring Isolators can take the abuse from Performance Suspensions, and are impervious to any contaminants--guaranteed!