DEI Ultra Block Reflective Material - 48in x 48inDEIs Ultra Block is the ultimate heat and noise barrier, engineered to reduce extreme temperatures and unwanted sound in even the toughest environments. Designed to withstand intense conditions, Ultra Block effectively shields against heat and dampens noise from generators, under hood areas, and more. Perfect as a hood liner or for any high heat, high noise application, Ultra Block helps create a quieter, cooler, and more comfortable experience.