Ribbed Smoked Sheet Rubber (RSS Rubber) is a form of raw natural rubber produced mainly in Sri Lanka by small and medium scale rubber growers. It is made from natural rubber latex which is treated and then made to coagulate. The latex is formed into sheets using a simple machine and is then air dried or smoked in ovens. Adopted mainly due to the simplicity and low cost of production, RSS rubber is mainly used by the tyre industry.