The Nelson EGS Firestop Products 4″ Plug AA0835P04 is a box of 6 fire barrier plugs made of intumescent polyurethane material. These red plugs have a depth of 4.7 inches and a fire rating of 2 hours, providing fire resistance for facilities and work sites. Manufactured by STI in the US, these firestop plugs are designed to prevent the spread of fire and protect property in case of emergencies. Each plug is lightweight at 0.47 lbs, making it easy to install and use in various settings requiring fire protection.