Flying ring

From RayWiki

A flying ring is an object in the original game which allows Rayman to reach inaccessible places. Once he gets the Grappling Fist from Betilla the Fairy, he simply has to punch them and then, Rayman will swing on an invisible rope, materialized by a sparkling line.

In Rayman 2, they are replaced by purple lums, and in Rayman 3, by flying hooks.