WHAT IS THIS CALLED AND WHERE DO I GET ONE?

Someone please help me!!!! I enrolled in a photography course and learned how to do all the cool stuff. We learned how to roll film on stainless steel reels, plastic reels and this other thing. I do not know what it is called, but it is a long strip of transparent plastic with crimped edges on both sides. It unwinds like a roll of film in your hand, and very flimpsy. I am having a hard time putting 120 film on the reels and this worked wonders. I have been ruining film and need to find out what the "cheat reel" is called and where I can get one.

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