Concerns over controversial self-defence keychains

Christchurch women worried about their safety are carrying controversial self-defence keychains, some of which contain offensive weapons and are

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They say using keychain as a flail is not effective, so I added a 3/4” tungsten carbide bearing just for fun : r/EDC

I know what it is not they are pointy a ribbed and they have a key chain ring on one end, any ideas? : r/Whatisthis

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Concerns over controversial self-defence keychains