Thin, lightweight, round, non-woven disk emits invisible, volatile corrosion inhibiting (VCI) vapors that fill confined air space to prevent metal corrosion. One Durabrite 10 disk provides corrosion protection for up to 10 cu. ft. for 24 months. Prevents moisture, salt, dirt, oxygen and other contaminants from corroding or tarnishing steel, aluminum, iron, zinc, copper, tin, brass, bronze, silver, nickel, nickel-plated steel, lead, magnesium, and others. Use in gun safes and cabinets, utility and tool boxes, shipping containers, and control boxes with exposed wires. Adhesive tape on back for easy installation. Mfg: Brownells SPECS: Compressed fiber disk. 2316" (56mm) dia. x A 1/4" (6.4mm) thick.39 oz. (12g) weight. Protects 10 cu. ft. for 24 months. One per pak.