The price differential of the Good Delivery material for the January 2013 contract month in the Rubber market has be determined as follows,
Pursuant to the provisions of Article 2.2 of the Rubber Delivery Detailed Rules, the price differential between the Good Delivery materials RSS No.3 and the non-standard grade RSS No.4 for the January 2013 contract month shall be -3.0 yen/kg.
Source: mondovisione.com