Help Identify this Delrin yoyo

I think these are made from Delrin. They were bought around 2005, maybe from Dave’s Skill Toys.
They have no markings and were packaged in a large “pill bottle” container.
Does any one know what they are?
Thanks, rockerrat


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Looks like recrev reverbs. Also welcome to the community.

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Correct…

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Yep that’s it. Thanks so much.
Now if I could figure how to set it up for looping I would be set.
A couple loops of the string will always wind around behind the pad, making for a very rough throw.
Thanks Again.