The Roboworm Straight Tail Worm combines Roboworm's exclusive ''Salt Release System'' with their robotic hand poured triple color technology. Unlike traditional worms, which have salt trapped inside or coated over the plastic, Roboworm infuses the head of the worm with salt allowing it to slowly leech out during your cast. A burst of salt is released when a fish bites, and the fish holds on longer for a better catch ratio.