Constructed with 2 layers 5/8 inch Type X UL Approved Fire Rated Drywall. Designed specifically for upgrading outdated sprinkler systems. Simple five minute installation allows for quick repair of one hour rated double layer drywall ceilings using in-house maintenance resources. Used in assisted living facilities, hospitals, university's and hotels nationwide. As low as $9.40 each in quantities of 100 or more. Shipping extra.