Spot rubber improved further on Wednesday. RSS 4 firmed up to ₹162 (₹161) a kg, according to traders. The grade improved to ₹161.50 (₹161) and ₹158.50 (₹158)respectively, according to the Rubber Board and the dealers. The trend was mixed.February futures concluded at ₹158.02 (₹158.41), March at ₹164.45 (₹163.83), April at ₹171.93 (₹170.94) on the National Multi Commodity Exchange. RSS 3 (spot) declined to ₹191.68 (₹194.98) at Bangkok. February futures weakened to ¥345 (₹201.57) on the Tokyo Commodity Exchange. Spot rubber rates (₹/kg): RSS-4: 162 (161); RSS-5: 152 (152); Ungraded: 135 (132); ISNR 20: 147 (147) and Latex (60% drc): 103 (103). Our Correspondent