This is Echo's with a Chipper Capacity, Max.: 3", Shredder Capacity, Max.: 3/4". Engine: Briggs & Stratton, Rotor Size: 27 lbs, # of Shredder Blades: 12. Engine Displacement: 306 cc, Engine Type: 4-stroke, Start Type: Recoil only, Fuel Tank: 0.8 gal. Oil Capacity: 37 oz. Overhead Valve: Yes