Sheetrock Brand UltraLight Panels Firecode X from USG is a lightweight type X gypsum panel. Designed for commercial and residential applications, the 5/8" panel for nonrated and 30-minute fire-rated partitions weighs 15% less than comparable type X boards. Sheetrock Brand UltraLight Panels score and snap easily and have higher strength-to-weight ratio and better sag resistance than traditional gypsum panels with comparable sound performance and impact resistance. Their lighter weight increases operational efficiencies and allows shipment of more panels per truck, resulting in fewer trips and lower fuel costs.