This is a 29mm diameter single use motor. It is ready to fly and doesn't need any motor hardware. You will still need a retaining system.
Because of the propellant type, to purchase this motor you must be Tripoli, AMRS or ARA level 1 certified (or attempting a level 1 certification).
G72 Dark Matter™ DMS™
Motor G125 Manufacturer Aerotech Type Single Use (Disposable Motor System™) Flame Blue Thunder™ (T) Quantity per pack 1 motor Diameter (mm) 29.0 Length (cm) 12.4 Ejection Delay (s) 14 Average Thrust (N) 125.0 Maximum Thrust (N) 160.0 Burn Time (s) 1.0 Total Impulse (Ns) 128.0 Total Mass (g) 115 Propellant Mass (g) 60