The PRORUN® PBB2417 51.7cc 570 CFM 250 MPH Gas-Powered 2-Cycle Backpack Leaf Blower is the ideal homeowner backpack blower for year-round general clean-up. The high-performance, 2-stroke, 51.7cc engine delivers reliable power. With 250 MPH air velocity and 570 CFM air volume, even heavy or wet debris doesn’t stand a chance. Starting is easy and reliable with spring assist that requires up to 30% pulling effort. A reduced vibration handle and padded harness combine to maintain comfort during long work sessions.