Okuma Sierra X Fly Fishing Reel - The Okuma Sierra X Fly Fishing Reel has an aluminum construction which makes this one tough little reel. Available in four sizes, the Sierra X has you out on the water and stripping away. Multi-disc, composite system 3 Bearings Roller bearing engages drag in one direction ALC: Alumilite diecast aluminum frame design Rigid diecast aluminum, larger arbor spool design