The three different knitting needles are made of nylon, Teflon and polyethylene. The image is of the Teflon needle, after it has been rubbed with a piece of paper to give it a negative charge. The droplets are squeezed out of a syringe, losing their electrons along the way and acquiring a positive charge. The resulting combination of microgravity and electric charge causes most droplets to freely be tugged around the knitting needle like clear and tiny planets.
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Astronaut Dan Burbank had the idea before leaving the earth, so decided to pack appropriately. For the experiment with the three different knitting needles being performed by the same man, check the video. It’s really quite amazing.