Spot rubber closed unchanged, while a leading tyre company bought the raw material at the prevailing level on Monday. RSS 4 finished flat at ₹159 a kg, according to traders. The grade was flat at ₹158.50 and ₹155.50 respectively as reported by the Rubber board and dealers. February futures weakened to ₹154.40 (155.99), March to ₹160.80 (162.63), April to ₹168.02 (169.26), May to ₹172.98 (173.98) and June to ₹175 (175.72) on the National Multi Commodity Exchange. RSS 3 (spot) slid to ₹189.13 (189.70) a kg at Bangkok. February futures edged to ¥320.3 (₹191.39) on the Tokyo Commodity Exchange. Spot rubber rates (₹/kg): RSS-4: 159 (159); RSS-5: 150 (150); Ungraded: 130 (130); ISNR 20: 148 (148) and Latex (60% drc): 101.50 (101.50).