Here is a compact knife you can wear underneath your shirt collar, sleeve, and other places discreetly. The HemiSERE Titanium Lapel Knife weighs only 4 grams and is only 1.3mm thick. You can carry it inside your smartphone case and wallet too.
More gadgets like this: here
This may be a tiny knife but lets you apply tremendous pressure on anything you would like to cut. You can get yours here.
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