Invisible Loop by Proma (6406)

You show a white spring/coil on a stand. A red ribbon hangs from both ends of the coil, you pull on both ends of the ribbon in turn to show that the ribbon just runs through the spring. Then you open the spring in the middle (or stretch it), but no ribbon is visible here! Finally, you pull the ribbon completely out of the spring, take the spring off the stand and hand them both over for examination!

Important:

• Carefully crafted by skilled artisans, with exquisite ingenuity.
• Complete with everything you need.
• Self-working / easy to perform
• Including instructions