RubberShox DuraTPE & DuraTPE Pro Series - Front-Rear automotive coil spring buffer/booster kit is a shock absorbent accessory package that provides a tighter, more resilient suspension. - This absorbs and dissipates the shock from rough road conditions with greater driving stability while extending the life of coil springs and the suspension system. - Universal Fitment Type: A / A+ / B / B+ / C / D / E / F Package List: 2 * Premium Shock Absorber Spring Buffers Note:Please allow 1-3 cm error allowance due to manual measurement. We appreciate your kind understanding. What is the difference between DuraTPE CSB series and the DuraTPE Pro CSBPro series? DuraTPE Pro uses high-density TPE material that removes the body hole to increase compression and flexibility. The hardness rating 65 is higher than the standard DuraTPE series rated hardness at 60. DuraTPE Pro, due to stronger material, it roughly raises ground clearance 1?-1.25? per buffer set installed) compared to the DuraTPE raises ground clearance roughly 0.5? ~0.75?. How does this product make my car feel "stiffer" while driving after they are installed? DuraTPE / DuraTPE Pro series with industry-standard hardness 60, is designed to add firmer and stiffer support to the older shock suspension. It also increases the ground clearance for the vehicle to preventing low ground clearance vehicles from hitting road bumps. When do I choose DuraTPE Pro over DuraTPE ? Choose DuraTPE Pro series if you are installing onto a heavier SUV or truck and prefer a higher ground clearance and a stiffer ride. Choose DuraTPE for your sedan if you prefer a softer ride and less ground clearance.