Spot rubber closed unchanged on Friday. RSS-4 finished flat at ₹131 a kg, according to traders and the Rubber Board. The grade was steady at ₹128. October futures concluded at ₹130.25 (131.44), November at ₹129.10 (128.99), December at ₹129.30 (129.05) and January at ₹130 (130.33) on the NMCE. RSS-3 weakened at its October futures to ₹117.72 (118.76) on the TOCOM. Spot rates (₹/kg): RSS-4: 131 (131); RSS-5: 127 (127); ISNR 20: 113.50 (113.50) and Latex (60% drc): 82.50 (82.50).