Our special Urethane Under-Bonnet Liner is designed to reduce noise over a broad frequency range whilst absorbing engine heat and dispersing it evenly without reflecting it back into the engine bay. This will help to protect your paintwork and reduce engine temperatures as well as reducing overall noise due to its open-cell structure. This liner can be applied to the underside of the bonnet or engine cover by itself or applied over a layer of Fatmat Sound Deadener, as these two types of mat are designed to complement each other, to give a greater reduction in noise. It has excellent resistance to heat, moisture and non-aromatic petro-chemicals. 19mm (3/4") Thick, self-adhesive liner, 1 Sheet: 138cm Long x 86cm Wide (54" x 34"). Comes in minimal, recyclable packaging.