The stainless sealed disc and ball-and-ramp drag system make it the best you can find for fighting big fish. Mirage II for line weights 3-5; 5.6 oz, 3A 1/2" in diameter. Mirage III for line weights 5-7; 6.2 oz, 3⅞" in diameter. Mirage IV for line weights 7-9; 8.9 oz, 4A 1/4" in diameter. Mirage V for line weights 9-11; 9.7 oz, 4A 1/2" in diameter. Mirage VI for line weights 11-13; 12.9 oz, 5" in diameter. Mirage VI-Deep for line weights 13-15; 13 oz, 5" in diameter. The size VI Mirage comes with two spool choices. Pick the high-capacity deep spool for blue water species or the standard shallow spool for the highest amount of line pick up for the serious tarpon angler. The Mirage is a technologically superior fly-fishing reel conceived and designed from the ground up and built in New England by American craftsmen to battle angry fish and laugh in the face of corrosive saltwater environments. It features a sealed and maintenance-free carbon and stainless steel disc drag system with an aggressive knurled drag knob that goes from zero to full drag in a single drag knob rotation. Patent-pending ball and ramp drag mechanism provides a smooth turning drag that follows a non-linear curve as the drag knob is turned to give smoother adjustments in the fishing and fish-fighting range. The reel is a super large arbor for increased retrieve rates and reduction in line coil. Machined in the USA from strong, yet lightweight 6061 T6 aluminum barstock. Ergonomically designed machined aluminum handle. Quick release spool easily converts from left to right-hand retrieve. Military-spec type III hard coat anodizing. Titanium shaft adds strength without additional weight. Fully radiused reel foot prevents kinked leaders. Low-profile counterweight won&';t catch fingers or fly lines. BACKING CAPACITY - NEW MIRAGE REEL Use the following table to understand how sizes relate to different metrics. LINE WEIGHT II III IV V VISHALLOW VIDEEP WF1 WF2 WF3 150 yds.* WF4 125 yds.* WF5 100 yds.* 150 yds.* WF6 125 yds.* WF7 100 yds.* 225 yds.* WF8 200 yds.* WF9 175 yds.* 250 yds.** WF10 225 yds.** WF11 200 yds.** 350 yds.** WF12 325 yds.** WF13 300 yds.** WF14 600 yds.*** Capacity in Yards*20-lb. DacronA(R) backing | **30-lb. DacronA(R) backing | ***50-lb. Gel Spun backing MIRAGE REEL SPECIFICATIONS: REEL DIAMETER II 3 1/2" III 3 7/8" IV 4 1/4" V 4 1/2" V 5"