This Reload burns for almost 3 seconds with the average thrust similar to D12 BP motor. This allows to send your rocket designed for D12 motor much higher.
The short, 3 second delay makes this motor perfect for heavier rockets. Propellant Type: Black Jack

This reload kits designed to fit RMS-20/40 rocket motor casing. Each pack of three reloads includes three FirstFire Jr. initiators.