A 15-foot section of single-strand No. 11 to No. 15 stainless-steel piano wire is toothproof, but hard to handle at boatside. It kinks easily, leading to break-offs, especially with high-flying makos. The 49-strand stainless cable leader eliminates kinks, but even a lowly blue shark can bite through the thinner metal strands one by one. Two-piece leaders with heavy mono and wire on either side of a ball-bearing swivel are a step in the right direction, but the mono chafes easily when it comes into contact with the shark’s raspy skin.