Echo Ion Fly Reel Spare Spool 7/9 Material: alloy Backing Capacity: [2/3] 75 yards, [4/5] 150 yards, [6/7] 150 yards, [7/9] 200 yards Diameter: [2/3] 2.9 in, [4/5] 3.4 in, [6/7] 3.7 in, [7/9] 3.9 in Recommended Use: fly fishing Manufacturer Warranty: 1 year