The Mighty Mac 12PT1100EX Chipper Shredder features a wide hopper which lets you feed leaves, small bush, stalks & other debris, powered by a 249cc Briggs & Stratton industrial commercial overhead valve engine which drives the 24 free swinging blades to strike the material over 65, 000 times per minute. The reduction ratio of 8 to 1 means you are left with a nutrient-rich mulch which can be recycled into the soil.