Set of four 30mm rings

Item sold in set of 4 rings.
Set of 4 rings:
Set of four 30mm strong rings.
To manufacture your own poi.
Technical characteristics:
- Internal diameter: 27mm.
- Outside diameter: 32mm.
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I am looking for 15mm rings to attach my chains to contact handles.
You don't have any more in stock? And U-bolts?
I remember ordering them from this site before, but I can't find them anymore.
At this time we do not offer 15mm rings. We will very soon be offering even smaller rings for assembling fire bolas or contact bolas which will be extremely resistant. As for the U-shaped connections, the manufacturer has stopped manufacturing them, so we are no longer able to offer them for the moment :-(