The First Fire Jr. Igniters from Aerotech, are a 2-wire igniter that are designed for easy insertion into most all composite propellant motors. They can be used in place of the Copperhead™ igniter that comes with all Aerotech motors. The "Jr" style have a smaller pyro-head so they can be fitted into smaller composite motors, like the Econojets™. These come with 8 inch leads, giving you plenty of wire length to make hook-up fast and effortless with standard "micro-clips." These igniters require 12V at a minimum of 3 amps of electricity -- a fully charged car battery works well. Package contains 3 igniters.