The mighty mac 12pt1100ex chipper shredder features a wide hopper which lets you feed leaves small bush stalks and other debris powered by a 249cc briggs amp 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