Daytona Magic, Inc.

Three pieces of rope are knotted into three separate rope rings. The rings are magically linked, and then two of the rings meld into a large ring. The small ring is unlinked from the large one, and magically you have three separate equal size rings again! The rings magically transform into three lengths of small rope tied together. The knots are blown away, leaving you with a long piece of rope.

The effect comes ready to use.