Spot rubber continued to rule firm on Monday. According RSS 4 improved to ₹135 (132) a kg as quoted by the traders. The grade firmed up to₹133 (131) and ₹130 (128) respectively, according to the Rubber Board and dealers. August futures concluded at ₹132.50 (132.28), September at ₹130.70 (131.23), October at ₹131 (130.06) and November at ₹129 (128.87) on NMCE. Spot rubber rates (₹/kg) follow: RSS-4: 135 (132); RSS-5: 130 (127); ISNR 20: 118 (117) and Latex (60% drc): 85 (84.50).