Rocket in a Jar is a passive item in The Binding of Isaac, added in the Repentance DLC.

+5 Bombs.

When placing a bomb while holding any fire button, an explosive rocket will be shot in the direction corresponding to the fire button held.

Rockets deal the same amount of damage as regular bombs and inherit bomb synergies.

Rockets are not affected by Isaac's shot speed.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.

Rocket in a Jar can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Rocket in a Jar have been documented.

* Note that not all possible synergies and interactions are listed here.

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Rocket in a Jar

• Placing a bomb while holding an attack button will instead launch the bomb as a rocket in that direction
• To place a normal stationary bomb, place it while pressing no attack buttons
• Abyss: x1 explosive locust .75x Isaac's damage

• Check out the item description on the external Isaac Wiki.