|This comb is the perfect concealed self-defense tool on the planet. The fluorescent colors range from neon green to bright blue. The rave-like look makes these covert, in disguise comb knives perfect for protection in nightclubs and even on the street. A harmless hair care accessory at first sight, this fully functional comb transforms into a knife, but not just any knife. By taking the comb apart, you reveal a 4.25 inch blade made from strong ABS plastic that can deal a great amount of damage to any attacker.