The 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. A nitrogen gas actuator provides 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. Five (5) actuator mounting positions to maximize the performance of any powerboat. Material White Composite Boat Size 17'-21' Application 80 to 150 hp / 2 or 4 stroke / 4 or 6 cylinder I/O Actuator 60 lb.