A number of fishermen prefer to mount EChips on other lures to improve hookups.  Pro-Troll makes two sizes of EChips and five different kits.  The large EChip is 3/4" long and the small size is 1/2" long.  Use the large size on big lures and the small size on small lures.  There are several ways the EChips can be mounted.  There are pictures of these here http://www.protroll.com/products/echip/kits/.  on the Pro-Troll website.  Each kit also comes with mounts and instructions on mounting.