From Rio's site

TOOTHY CRITTER LEADERS
7.5 ft (2.3 m), .027 inches (0.737 mm) butts with an ultra stiff 15 lb tippet for casting big flies.

For pike, bluefish, barracuda and similar species
Each tapered leader has a shock tippet of nylon-coated stainless steel wire with a small stainless steel snap to change flies easily, or thin brown Vectran wire you can tie a knot in.

As for flies...big ones.
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I am still not a cop.

EZ Thread Yarn Balls

"I don't care how you catch them, as long as you treat them well and with respect." Lani Waller in "A Steelheader's Way."