Spot rubber prices declined on Friday in subdued trade and slack demand. RSS 4 slipped further to Rs121 (Rs122) a kg, as reported by the traders. The grade dropped to Rs122 (Rs123) and Rs119 (Rs120) respectively, according to the Rubber Board and the dealers. August futures weakened to Rs120.90 (Rs122.44), September to Rs119.80 (Rs121.89) and October to Rs119.71 (Rs121.60) on the National Multi Commodity Exchange. August futures closed at ¥191.7 (Rs98.94) on the Tokyo Commodity Exchange. Spot rubber rates (Rs/kg): RSS-4: 121 (122); RSS-5: 118.50 (119); Ungraded: 106 (107); ISNR 20: 109 (109) and Latex 60%: 100 (102.50).