RonZ lures are built for, among other things, catching large, offshore pelagic species like tuna. They're heavy, which helps when it comes time to make that oh-so-crucial long cast into a fast-moving school that's here one second and gone the next.
RonZ makes ultra-heavy-duty plastic baits meant for long casting and heavy abuse from some of the biggest fish in the sea.
I've caught fish in the 200-pound range on one, with neither hook nor soft plastic showing any sign of strain. Just make sure to go for the "4X" hook design, which is made with a swivel, rather than a through-wire hook, which, despite being moderately strong, will bend and break.
The best thing about RonZ lures, apart from the durability, is how fast they sink while still maintaining a lifelike action. The fish I caught came up for the lure while it was dropping down to about 100 feet and I was doing literally nothing. A lure that fish will hit when you're idle on your end, is a good lure, but one that can repeatedly survive being smashed by giant tuna is a great lure.
What helps is that these are not terribly expensive lures in the big scheme of things. They're far less costly than most trolling lures, and they require much less material and attention to produce than fancy surface plugs.
If you're going fishing anywhere there are squid or long thin bait fish like mackerel, eels, or herring, you probably will appreciate having a few of these in your tackle box. Just make sure to size them accordingly to the species (and size) trying to imitate.
One captain I've fished with, Dom Petrarca of Coastal Charters Sportfishing, swears by them, and currently holds the spinning rod and reel world record for bluefin tuna. On 360Tuna, a tuna fishing forum, he also claims he's done well by slow-trolling them at less than 3 knots. I haven't tried trolling them yet, but knowing that he does, I will now.
Even if you don't have a clue about what you're doing out there, having a kit full of RonZ lures will give you a much better chance of hooking up out there.
Pros: Relatively affordable, highly versatile
Cons: You'll have to replace the tails every so often if you're catching a lot of fish (but that's a good thing)
Shop RonZ lures on Amazon starting at $5.99