Cogged Wedge Belts Cogged wedge belts have been developed to handle the majority of industrial applications running on ISO wedge pulleys. Cushion rubber assures good adhesion between cushion and cord, the rubber cushion is fibre loaded chloroprene compound giving good transverse belt stiffness. The tension members (cords) are made from polyester yarns pre-tension of cord during the impregnation process gives low stretch of the belt on application.