Spot rubber prices ruled firm as the market regained strength on enquiries from the tyre sector while it continued to experience acute shortage of the raw material. RSS 4 improved to ₹114 (₹113) a kg, according to traders and the Rubber Board. The grade firmed up to ₹111 (₹110) per kg as reported by the dealers. The volumes were low. April futures concluded at ₹117.65 (₹116.61), May at ₹119.19 (₹118.39) and June at ₹120.60 (₹119.33) on the National Multi Commodity Exchange. RSS 3 (spot) firmed up to ₹101 (₹100.58) at Bangkok. April futures closed at ¥169.3 (₹99.28) on the Tokyo Commodity Exchange. Spot rubber rates (₹/kg): RSS-4: 114 (113); RSS-5: 112 (111); Ungraded: 108 (107); ISNR 20: 108 (107) and Latex (60% drc): 81.50 (80.50).