This is a great boredom breaker/slow feeder - and it stops hay blowing around the field. The conical shape rolls in a circle so it does not go straight across a field and under a hedge or fence. It is a serious feeder and will take as much hay as a large haynet or hayrack. The filler is funnel shaped to make filling very easy. Dual purpose, it is also a pole block. Moulded from exceptionally tough STUBBYTHENE. Comes with tough, innovative lid for both horse and pony.