Spot rubber finished firm on Friday. RSS 4 improved to ₹130 (₹129) a kg, according to traders and the Rubber Board. The grade closed at ₹127 (₹126), according to dealers. June futures increased to ₹129.10 (₹128.15), July to ₹129.10 (₹128.39), August to ₹128.74 (₹128.01) and September to ₹127.97 (₹127) on the National Multi Commodity Exchange. RSS 3 (spot) inched up to ₹102.53 (₹102.46) at Bangkok. June futures closed at ¥158 (₹97.68) on the Tokyo Commodity Exchange. Spot rubber rates (₹/kg) : RSS-4: 130 (129); RSS-5: 126 (125.50); Ungraded: 109 (107); ISNR 20: 110.50 (110) and Latex (60% drc): 94 (94).