All Rapala saltwater Silver lures are designed tough to withstand the rigors of the big water environment. Seven coats of paint, PermaSteel hooks and fittings to ward off corrosion, securely attached lips to take the beating of oyster shells and coral. Every step of the way, Rapala lures are designed with the finest materials and craftsmanship that has made these "The World's Favorite Lures." The ultimate trolling lure for tuna and most other saltwater varieties. Broken-back design creates an attraction action that fish find irresistible. Hand-tuned to run at any speed in any see condition.