A red silk handkerchief is tucked into one end of the Crystal Tube followed by a green silk and then a yellow one. Each silk is completely separate from each other. You raise the tube to your mouth and blow through the tube. Amazingly, the silks fly out knotted together. The beauty of this effect is that the audience never loses sight of the silks through the transparent tube.
 
CONDITION NOTES:  Unused condition. The box shows minor storage wear. Original rubber bands had dried out and have been replaced with a small supply of working substitutes (smaller than original, but functional).