Skiffs usually provide for one or two scullers but because they have been built to individual customer's specifications, there can be a wide variety of designs. There are skiffs with three or four rowing positions. Skiffs with more than one sculler have a seat for a coxswain who steers the boat by ropes attached to a rudder. Single scullers usually steer themselves, but some single skiffs allow for a cox/passenger as well. Some skiffs also provide for a sail to be used.