The G-9 spool. This is serious business. At a mere 8.3 ounces and 4.5 inches in diameter, this reel is still more than one ounce lighter than our competitors' 8 weight reels and picks up line twice as fast (if not more). We thought it would be too big, but we love it. It makes the NV 8/9 look tiny. This Giga arbor spool will bring your salmon skipping back to you in a heartbeat. It looks mean, acts mean and is mean. This one does! This is a must have. Fit, form, function and balance, nothing beats it. Revolutionary, like all Nautilus reels!