Spot rubber closed unchanged on Thursday. RSS 4 finished flat at ₹100 a kg, according to traders. The grade was quoted steady at ₹100.50 and ₹97.50 respectively by the Rubber Board and dealers. January futures improved to ₹103.69 (₹101.24), February to ₹104.60 (₹101.93) on the National Multi Commodity Exchange. December futures closed at ¥151.9 (₹82.39) on the Tokyo Commodity Exchange. Spot rubber rates (₹/kg): RSS-4: 100 (100); RSS-5: 97.50 (97.50); Ungraded: 90 (90); ISNR 20: 82.50 (82.50) and Latex (60% drc): 75 (75).