Cobalt (Top Only) is a luminous blue sphere top. Cobalt (Top Only) is for the Defender Ring ring top only. It does not come with the Defender Ring band and self defense blade.
Wear Defender Ring on your index or middle finger as an everyday jewelry ring. In a dangerous situation, make a fist to secure Defender Ring to your hand, and unscrew the ring top in a counter-clockwise direction to unsheathe the knife weapon. Defend yourself by punching or striking an attacker with your ring knife to cut skin, draw blood, and collect DNA.