A cope cage, also known as slat armor or bar armor, is a type of vehicle armor designed to protect against certain types of explosive devices, particularly shaped-charge projectiles, such as rocket-propelled grenades (RPGs) . It consists of a series of metal or composite slats or bars, typically arranged in a grid pattern, attached to the outside of a vehicle. Cope cages are designed to be relatively lightweight and modular, allowing for easy installation and removal, which enables vehicles to be adapted to different threat levels and operational requirements. They are commonly used in military vehicles, particularly those operating in environments with a high risk of RPG attacks, such as urban or asymmetric warfare scenarios. While cope cages can offer increased protection against RPG attacks, they are not foolproof, and their effectiveness depends on various factors, including the design, quality, and deployment of the armor.