These spindles are unique and are used in a different way to most other spindles. They have two cross pieces instead of a 'whorl' or disc (that makes the spindle spin) and these can be removed from the spindle in order to end up with a ball of yarn.
They spin slowly and keep going for a long time. The story is that Turks used to stand on the roof of their houses to spin and drop the yarn over the side in order to get a long draft and not have to wind the yarn on very often! Participants will have a small hank of yarn to take home.