Mine is about 5' wide with a 4' diameter, and I was told it is filled with used oil (to prevent freezing and rust). I think it is part of what was once a 10' wide double gang roller. The spikes are about 1.5" in diameter and maybe 6" long with a small "foot" on each. I replaced a couple missing spikes with solid round stock with no "foot". I pull it with a small dozer since it's too much for my 38hp compact tractor. I'll try and remember to take a picture and post it.