This is a pack of three AeroTech First Fire Jr. Ignitors, and are intended for use with E, F and G class composite rocket motors. First Fire Jr. Igniters 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 some Aerotech motors. The "Jr" style have a smaller pyro-head so they can be fit into smaller composite motors, like the Econojets™. The First Fire igniters come with long leads, giving you plenty of wire length to make hook-up fast and effortless with standard "micro-clips."