Colour Family: WHITE Material: PLASTIC Diameter: 4" . Heavy duty, rigid plastic surround that completely covers your existing vent cap • Made of ABS plastic • Durable • Helps to prevent unwanted pests from entering the duct or home • Hinged frame locks in the open position for easy removal and cleaning of lint debris that may form on the cap, barricade and duct • Fits over most 3" and 4" vent caps including many wide mouth models