Spot rubber turned weak on Tuesday. RSS 4 declined to ₹134 (₹135) a kg, according to traders and the Rubber Board. The grade dropped ₹131 (₹132), as per reports by traders and dealers. The trend was observed to be mixed,May futures surrendered to ₹131.50 (₹134.57), June to ₹133.65 (₹136.65), July to ₹133.88 (₹137.28) and August to ₹133.75 (₹137.30) on the National Multi Commodity Exchange. Spot rubber rates ₹/ kg were: RSS-4: 134 (135); RSS-5: 132 (133); Ungraded: 118 (120); ISNR 20: 122 (123) and Latex (60% drc): 104.50 (104.50).