Diameter: [0] 2.75 in, [I] 3.30 in, [II] 3.75 in, [III] 4.10 in, [IV] 4.75 in * Fly Line Weight: [0] 1 / 2 wt, [I] 3 / 4 wt, [II] 5 / 6 wt, [III] 7 / 8 wt, [IV] 9 / 10 wt * Material: aluminum * Backing Capacity: [0] 50 yards / 20 lbs, [I] 75 yards / 20 lbs, [II] 200 yards / 20 lbs, [III] 205 yards / 20 lbs, [IV] 275 yards / 30 lbs * Recommended Use: fresh & saltwater fly fishing