These engines Not can eject the parachute so should not be used for models to a single stage.
The pack includes 3 engines, 3 lighters and 3 stoppers for the lighters.
Features
Length: 70 mm
Diameter: 24 mm
Weight: 41 g
Duration: 1.6 sec.
Max weight of model: 396 gr
Type: Booster (Red Label)