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Specifications: Material: Alloy Aviation Aluminum(solid) Size: (L) Approx.14 cm / 5.51 inch; (Diameter of Self-Defence Key Chain): 1.5 cm / 0.6 inch Package Details: ✔ 4 x Black Self Defense Key Chain ✔ 1 x Anti-lost rope ☞ You can kindly watch some training videos: The Method of using Self-Defence Key Chain: Searching the major video websites, you can see many professional teaching videos at home and abroad, without any martial arts skills, suitable for all ages of office workers, students and other people to use.