Historical Futures Prices: SICOM Rubber Futures, February 2017 (TFG2017), February 2017. Natural rubber is a processed material obtained from the latex of Hevea Brasiliensis trees and may be used to manufacture different grades of rubber. Technically Specified Rubber (TSR) is liquid latex which has been allowed to congeal naturally and reformed into blocks that can be used in tyre manufacturing. Ribbed Smoked Sheet (RSS) is liquid latex rolled into sheets and put through a smoking process. With over 80 years of trading heritage, the SICOM market is recognised as the world's price discovery centre for natural rubber and synonymous with providing the pricing standard for the rubber industry globally. SGX offers two SICOM Rubber Futures - RSS3 and TSR20 to provide market participants with a reliable pricing basis as a point of reference for their physical cargo and to manage price risks. SGX remains committed to serve as a pricing benchmark for regional and global producers, traders and consumers. Contract Size: 5 metric tonnes. Delivery Units: 20.16 metric tonnes of TSR20 manufactured from rubber produced from the Hevea Brasiliensis trees by factories approved by SICOM from time to time and shall be packed in accordance with SICOM's prevailing shrink-wrap packing specifications.