Spot rubber improved tracking the moderate gains in domestic futures on Monday. RSS 4 flared up to ₹133 (₹130) a kg, according to traders. The grade closed firm at ₹130.50 (₹130) and ₹127.50 (₹127) respectively, according to Rubber Board and dealers. June futures firmed up to ₹132.81 (₹128.95), July to ₹133.73 (₹129.06), August to ₹133.29 (₹128.33) and September to ₹131.75 (₹127.97) on the National Multi Commodity Exchange. RSS 3 (spot) weakened to ₹ 102.17 (₹102.53) at Bangkok. June futures closed at ¥159.8 (₹99.98) on the Tokyo Commodity Exchange. Spot rubber rates ₹/ kg were: RSS-4: 133 (130); RSS-5: 129 (126); Ungraded: 112 (109); ISNR 20: 113 (110.50) and Latex (60% drc): 95 (94).