WHAT ISTHE JAMMER? The Jammer is shaped like a candy cane and is used by fire, police and emergency services personnel. The candy cane is dropped onto the hinge of a door and prevents the door from closing. The Jammer is crafted from solid ABS plastic, chosen for its exceptional durability and long-lasting performance. Each unit is molded in our New Jersey facility to ensure consistent strength and reliability in the field. The Jammer is built to withstand heavy use while remaining lightweight and easy to deploy.