CLASSICS ARE NOISY! This self adhesive Bitumen pad will help reduce noise levels and we have sourced the last ever bitumen sheets in the UK, fact. These pads were put into the original cars in the 60's. If, for example, you place one of these pads to the centre of a door panel, it will attract noise and drumming to it. This is an automotive fact. If you place several of these pads around the bulkhead and the floor panels, it will reduce the drumming of the exhaust. This is automotive fact. We will say no more. This is a cheap and easy way to reduce noise levels! These pads measure 30cmx 19cm (12" x 7.5") each and are manufactured from Bitumen with added mineral fillers and synthetic rubber to form a highly vicoelastic material.