Pro-Troll Fishing Products 4500 Roto Chip Head Bait Holder with EChip- Pack of 3 (Clear, 3/4-Inch Wide Head) Three RotoChip bait heads unrigged in a package  each with an EChip embedded in the head Embedded EChip bait technology duplicates the electrical nerve discharge of live bait, which triggers strikes by nearby predators Field tests worldwide indicate the EChip improves catches by up to ten to one