SR8 Diameter 9.7cm / 3.8" Weight 230g / 8.1 oz Line 8 Backing 200m 50lbs + WF8 SR9 Diameter 10.1cm / 4" Weight 243g / 8.5 oz Line 9 Backing 250m 50lbs + WF9 SR10 Diameter 10.8cm / 4.3" Weight 277g / 9.8 oz Line 10 - 11wt Backing 285m 50lbs + WF10 The SR10 is sized for a 10 or 11 weight single hander or a 9 or 10 weight 14ft Spey rod. SR12 Diameter 11.7cm / 4.6" Weight 310g / 10.9 oz Line 12wt Backing 350m 50lbs + WF12 The SR12 is sized for a 12 weight single hander or 15ft Spey rod.