For when you need chunky Vintage Plastic 2cm Lifebuoys.You could put a metal jump ring on the top to hang them from necklaces, earrings, bracelets, whatever you choose to hang them from, or just attach to things with thread or ribbon.
Made from strong plastic in gloriously kitsch colours.
There is the odd bit of uneven plastic caused by the moulding process - easily removed with a nail file.