Minecraft wiki entry for Combat, associated text: Fireworks: A dispenser loaded with Firework rockets will launch the rockets in the direction the dispenser is facing. This allows the player to launch firework rockets sideways and presents them with a high customization type of ammunition. A firework rocket will, upon exploding deal 5–6 hearts of damage for first firework star loaded into it and 1–2 for each extra fireworks stars. All firework stars go off simultaneously when the rocket detonates and up to 7 firework stars can be used per rocket, making a max-payload rocket deal a whopping 11-18 hearts of damage upon exploding. Alongside firework stars, the player can also add more gunpowder to the rocket to extend its range and fuse length, allowing the player to time it to detonate after traveling a certain distance. Up to three gunpowder can be used but be aware that adding more gunpowder will reduce the amount of fireworks stars that can be added and vice versa.