Spot rubber lost ground following the declines in global markets and domestic futures on Thursday. RSS 4 weakened to ₹127 (128) a kg, according to traders. The grade slid to ₹127.50 (128) as reported by the Rubber Board. Spot rubber rates (₹/kg): RSS-4: 127 (128); RSS-5: 123 (124); ISNR 20: 123 (123) and Latex (60% drc): 83 (83).