Defender Ring is a self-defense weapon for women, designed as a ring knife. The term "ring knife" describes Defender Ring very well; a person wears a jewelry ring around her finger that has a knife attached to it for self-defense purposes.
Self Defence Ring with Concealed Blade - Defender Ring
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Best Self Defense Weapons for women Self Defense Ring Jewelry – Annie Ring
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Sphere, 18K Gold
Self Defense Ring - Spike and Hidden Knife Rings Protection Jewelry – Self Defense Rings