Turbo Blanket T4 Black colour incll springs - This is NOT a cheap chinese product available at the corner shop - this is the premium product with a max temperature rating internally of 1100DegC - max continuous temp limit is 1000DegC - max RADIANT heat (externally) Limit 593DegC - max CONTACT temp limit externally 316DegC The blanket is designed to have an air gap between the inside of the blanket and the turbine housing - proper fitment and sizing is critical to a reliable result. Use the supplied springs to install the product and DO NOT force the blanket tightly over the turbine housing.