Spot rubber was almost unchanged on Friday. RSS 4 finished flat at ₹131 a kg, according to traders. The grade closed steady at ₹130 and ₹127 respectively, according to the Rubber Board and dealers. December futures weakened to ₹132.80 (₹133.28), January to ₹135.30 (₹135.73) on the National Multi Commodity Exchange. RSS 3 (spot) slid to ₹140.36 (₹140.78) a kg at Bangkok. December futures declined to ¥230.5 (₹139.84) on the Tokyo Commodity Exchange.