Spot rubber continued to rule firm on Tuesday. Certain tyre companies were buyers on RSS 4 at the prevailing levels and it improved further to ₹97 (₹96) a kg, as reported by the traders. The grade firmed up to ₹96 (95) and ₹93 (92) per kg respectively, according to Rubber Board and the dealers. March futures declined to ₹96.70 (₹98.98), April to ₹100.15 (₹102.32) and May to ₹102.10 (₹104.52) on the National Multi Commodity Exchange. RSS 3 (spot) firmed up to ₹88.86 (₹87.62) at Bangkok. February futures closed at ¥141.5 (₹86.58) on the Tokyo Commodity Exchange. Spot rubber rates (₹/kg): RSS-4: 97(96); RSS-5: 94(93); Ungraded: 90(88); ISNR 20: 90 (88.50) and Latex (60% drc): 76 (76).