Spot rubber improved further as tyre companies bought RSS 4 up to ₹132 per kg on early trades and it finished the session at ₹133 (130) after hitting an intra-day high of ₹135, according to traders. The grade concluded at ₹132 (128) and ₹129 (125) respectively, according to Rubber Board and the dealers. April futures declined to ₹135 (136.57), May to ₹134.60 (137.69), June to ₹134.90 (137.69) and July to ₹139 (139.06) a kg on the National Multi Commodity Exchange. RSS 3 firmed up at its April futures to ¥186.5 (₹113.66) on the Tokyo Commodity Exchange. Spot rubber rates (₹/kg): RSS-4: 133 (130); RSS-5: 131 (128); Ungraded: 125 (125); ISNR 20: 122 (121) and Latex (60% drc): 101 (98.50).