You have spent the time, effort, and money—so protect your investment with Energy Suspension’s Coil Spring Isolators. New coil springs are not complete without Energy Suspension’s new polyurethane 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 Hyper-Flex polyurethane spring isolators can take the abuse from performance suspensions, and are impervious to any contaminants—guaranteed!