Fair Isle knitting ring (SG17 (Shefford))

Do you have a Fair Isle knitting ring you can spare?
This is a ring with one or two loops (it may even look like a spring) used for controlling different yarns while knitting with two or more colours.
Having just got back into knitting, I'm using a number of colours together (which I manage to tangle) and I'd like to try one of these rings to see how it works and whether it works for me. There are lots online and without experience, it's hard to know the pros and cons of the different designs.
Thank you
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