THE SELF DEFENSE ALUMINUM KEYCHAIN IS MADE OF SOLID AVATION ALUMINUM. IT HAS CHARACTERISTICS OF LIGHT WEIGHT AND SOLID CRAFT, NOT EASILY GET SCRATCHES. YOU CAN INSTALL IT ON YOUR KEY CHAIN. ALSO YOU CAN PUT IT ON YOUR BAG OR SOMEWHERE ELSE. IT NOT ONLY BRINGS SAFETY FOR PEOPLE, BUT ALSO COULD USE IT TO PRESS THE BUTTON OF ELEVATOR, AND IT COULD BE AS A PEN TO WRITE WORDS ON THE SCREEN OF YOUR PHONE. DON'T MISS OUT ON THIS PRACTICAL PROMO! 5.5" L X 0.6" W