Make Ribbon

i want to create something like this in Rhino:

(Not The Music bars, The thing that i want is the Circle that is turned to ribbon)

How can i do this?

Ribbon command offsets a curve and creates a ruled surface between the two curves. (Please read Rhino help file to learn the basics.)

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Hello - see if the attached file helps at all.
CircletoRibbon.3dm (96.7 KB)


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Actually it is simple task for rhino, here a small explanation: