Spot rubber regained strength catalysed by the sharp gains in the global trendsetters on Tuesday. RSS 4 improved to ₹131 (₹129) a kg as reported by the traders. The grade firmed up to ₹131 (₹129.50) and ₹128 (₹126.50) respectively, according to the Rubber Board and dealers. December futures improved to ₹133.50 (₹128.39), January to ₹137.88 (₹132.58), February to ₹140.50 (₹135.20) and March to ₹143.95 (₹138.46) on the National Multi Commodity Exchange. RSS 3 (spot) flared up to ₹151.66 (₹142.94) at Bangkok. December futures improved to ¥267.3 (₹156.38) on the Tokyo Commodity Exchange. Spot rubber (₹/kg): RSS-4: 131 (129); RSS-5: 126 (125); Ungraded: 120 (115); ISNR 20: 120 (117.50) and Latex (60% drc): 82.50 (82).