This is a vertical loom with 2 shafts. It can hold very high tension and so is suitable for rug weaving. My model has a 3rd pedal for releasing the beater to fall upon the fell. I understand that other models don't have this 3rd pedal, but instead have a spring which keeps the beater away from the fell except when the weaver pulls it down. Not having used the spung model, I don't know which might be easier to use. But I suppose that a falling beater might be able to beat harder which is a plus for rugs, while a sprung beater might be less work to use.