Product Description: Nauticus SX951040 Smart Tabs SX Composite 9.5" x 10" With 40 lb. Actuator EAThe SX series incorporates the fully automatic features of original Smart Tabs with the rust and corrosion free benefits of thermo-molded CoPolymer composite materials. The one-of-a-kind Smart Tabs system is continually active, adjusting to water conditions, boat speed and payload without the need for operator adjustment while underway. Improves acceleration, bow angle, ride and handling, top speed and fuel economy. Smart Tabs SX use a nitrogen gas actuator providing smooth adjustment to boating conditions without the use of hydraulics or electric switches. Assembly and installation can be completed on most aluminum, wood, or fiberglass transoms in less than an hour using common tools. The system can be specifically tuned with five (5) actuator mounting positions to maximize the performance of any powerboat.