Comfort COBRA - 10 Sheets 2.3mm 500x700mm Sound Deadening Mat KitComfort COBRA 10 Sheets 2. 3mm 500x700mm Sound Deadening Mat Kit Comfort Mat COBRA is a 2,3mm vibration deadening mat with foil thickness of 120 microns. It has an increased adhesion to metal, mastic is made from a mixture of special polymers. The use of a modified elastomer in the composition of the mastic gives the material a high mechanical loss factor, excellent adhesion, resistance to environment and a wide temperature range of work. COBRA mats