Covering purchases at lower levels kept spot rubber firm on Wednesday. RSS 4 improved to ₹122 (120) a kg according to traders. The grade closed unchanged at ₹121 and 118 respectively according to the Rubber Board and the dealers. The trend was mixed. June futures improved to ₹120.75 (118.25), July to ₹125.75 (123.02) and August to ₹127.43 (124.56) on NMCE. RSS 3 (spot) firmed up to ₹117.36 (114.72) a kg at Bangkok. June futures flared up to at ₹121.91 (12.24) on TOCOM. Spot rubber rates (₹/kg) were: RSS-4: 122 (120); RSS-5: 119 (117); ISNR 20: 108(108) and Latex (60% drc): 91 (91).