TeraFlex SpeedBumps have the following features: • JK Specific tuned for high speed performance • Simple installation - no welding required • Quiet movement & function (no pad-slap clunk) • Absorbs large impact energy progressively during compression to help prevent bent axle tubes • Maintenance free, all-composite construction. No gas charging from leaks. • Resistant to all types of conditions (mud, salt, sand, dust, etc.) • Compatible with all suspension systems that retain factory axle & spring mounting locations. Universal 3 and 4" stroke SpeedBumps coming soon for other applications. • High compression rate with full memory rebound • Engineered for maximum lifetime compression cycle • Unsurpassed dynamic performance • Maximum low temperature flexibility reduces fatigue & premature failure in subzero conditions • Limited lifetime Warranty • Made in the USA • Patent Pending technology