Automatic performance trim system. The patented SMART TABS are a one of a kind trim and stabilizer system that automatically adjusts to the sea conditions, without the need for expensive electric or hydraulic hardware and switches. The system constantly reacts to the water conditions, boat speed, and balance providing a remarkable improvement on any boat. The new SX Series incorporates all of the fully automatic features of the original stainless steel systems enjoyed by thousands of satisfied customers. Installs in minutes, complete assembly and mounting requires only a drill, 3/16 bit and a phillips screwdriver. Rugged design: Thermo Mold Co Polymer Composite material provides superior strength and resilience for any rough water situation. Rust and corrosion are also eliminated so there is no need for anodes. In short NO MAINTENANCE. Automatic Performance trim system provides: 15% Quicker Acceleration, 11% More Fuel Economy, 50% Less Bow Lift, and 10% More speed. This model fits: 12-15' boats. 20-35hp outboards.