The Mace Brand Key Guard Sprays have a powerful OC pepper formula that creates and intense burning sensation and causes an attacker?s eyes to slam shut upon direct contact. OC pepper is a naturally occurring substance derived from cayenne peppers. - The Mace Keyguard is approximately 3? long, the compact design makes it convenient to carry - perfect for on the go. It includes a key ring that can be easily attached to your house, office or car keys! This model also features a hinged safety cap that flips open to reveal the actuator button, and an orientation tab that allows you to feel when the unit is properly aimed..