CLASSICS ARE NOISY! This self adhesive Bitumen pad will help reduce noise levels. 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 20cm (12\ x 7.5\") each and are manufactured from Bitumen with added mineral fillers and synthetic rubber to form a highly vicoelastic material. Top selling product."