Cool-Tape by DEI. Made of glass fibers, characterized by very high thermal resistance. Temperature resistance: continuous operation: 650 ° C, momentary jumps: 1100 ° CAn important first step in reducing unwanted and power-robbing under hood heat is wrapping headers and down pipes. Less under hood radiant heat results in a cooler air charge for improved performance and keeping exhaust gases hotter within the exhaust system helps in decreasing exhaust density & increases exhaust flow.Design Engineering Stainless Steel Locking Ties are the perfect way to fasten exhaust wrap for a easy , clean and professional installation. Reduce under hood temperatures a realistic 50% Decreases exhaust density & increases exhaust flow Improves horsepower Withstands 1200 ° F direct / 2000 ° F radiant Only exhaust wrap with installation guide lines Added durability and heat retentionNOTE: Design Engineering HT Silicone Coating spray is highly recommended for DEI glass fiber wrap to penetrate, seal, protect and prolong the lifespan of exhaust wrap.Direct Heat Resistance: 1200 ° FRadiant Heat Resistance: 2000 ° F DEI Cool-Tape Thermal Tape Made of glass fibers, characterized by very high thermal resistance. Temperature resistance: continuous operation: 650 ° C, short-term jumps: 1100 ° C