Garelick/EEz-In Active Seat Suspension System - 13" x 7" Active Seat Suspension Systems Absorb And Minimize Up To 75% Of The Shock, Jolt, And Vibration Transmitted To The Passenger From The Forces Of Roll, Pitch, And Yaw Active Seat Suspensions Systems Reduce The Feelings Of Seasickness And Nausea By Absorbing Excessive Movement With 1" Of Damped Vertical Travel These Systems Are Cad Designed, Fea Proven, And Precision Engineered And Tooled Components Are Saltwater Spray 77000Ed And Uv Stable; To Help Endure Harsh Marine Environments Made from rugged, high-tensile, anodized aluminum with stainless steel hardware