Blue Max 6595 18-Inch 45cc 2-Stroke Gas Powered Chain Saw 18-inch bar and chain 45 cc single cylinder, 2 stroke; 2800 rpm no load speed; cdi ignition system.Anti-vibe handle features extremely low vibration to help reduce fatigue 0325-inch pitch; 0055-inch gauge; 21 bp chain Rapid-reaction kick-back brake (quick stop), hand guard, safety trigger and convenient on/off switch Optimum engine characteristics with high quality cylinder, auto oiler keeps bar lubricated