Hitachi CG22EASSLP 21.1cc 2 Stroke Gas Powered Straight Shaft Grass Trimmer 21.1cc commercial grade engine provides excellent performance and reliability S-Start reduces the amount of pull-force required to start the unit by 50% Anti-Vibration System provides maximum comfort for getting more done with less fatigue 4-inch semi-automatic trimmer head provides hasslefree operation and holds 13 feet of .095-inch copolymer cutting line. CARB Compliant