This Troy-Bilt handheld gas blower features a 25cc, 4-cycle engine that delivers 400 CFM and blows at 150 MPH. Blower Type: Handheld, Cylinder Displacement (cc): 25, Air Velocity (MPH): 150, Air Volume (CFM): 400 400 CFM; 150 MPH 25cc, 4-cycle engine Spring Assist starting system Bottom handle for 2-hand operation Low noise