50 cubic ground driven spreader. Totally AWESOME! Had been hand wringing on what to do with the pile of manure that I would haul out with a two-wheel barrow to the pile and then pile higher with a skid loader. After reviewing several brands over two years, I settled on ABI. Customer service was incredible! WasnÕt pushy and actually followed through on call backs to see how things were going. After a year of back and forth phone calls , I bought the 50. Not cheap, but money well spent. Have a 30 horse Kubota I haul it with and made 27 trips of the initial pile the first weekend I got it. Well made and tough as nails. Would HIGHLY recommend it to any small farmer like myself.