Single Weft: is called "Sennah Baft" or Hamadan weave. Here the wefts are rigid and the warps are sinuous. As you can see in the sketch the wefts are heavier than the warps. It is woven with symmetrical knots. Since there is only one shot of weft between each row of knots this shows every other warp which makes these rugs easy to spot. A "Single Weft" carpet means that after a row of knots is tied; the loom pedal (shed) is operated - separating alternating rows of warp threads. The weft thread is passed from one side to the other. Another row of knots is then tied and the loom shed is reversed and the weft is passed back through. This results in a single weft thread between each row of knots. In these carpets, the warp threads will be visible.